# HelpBox

> Makes a help box with a message to the user. For more information, refer to UXML element HelpBox.

## Definition

* **Type:** Class
* **Namespace:** [UnityEngine.UIElements](/engine/6000.6/script-reference/unityengine/uielements.md)
* **Assembly:** UnityEngine.UIElementsModule
* **Inherits from:** [VisualElement](/engine/6000.6/script-reference/unityengine/uielements/visualelement.md)
* **Implements:** [IEventHandler](/engine/6000.6/script-reference/unityengine/uielements/ieventhandler.md), [IResolvedStyle](/engine/6000.6/script-reference/unityengine/uielements/iresolvedstyle.md), [ITransform](/engine/6000.6/script-reference/unityengine/uielements/itransform.md), [ITransitionAnimations](/engine/6000.6/script-reference/unityengine/uielements/experimental/itransitionanimations.md), [IExperimentalFeatures](/engine/6000.6/script-reference/unityengine/uielements/iexperimentalfeatures.md), [IVisualElementScheduler](/engine/6000.6/script-reference/unityengine/uielements/ivisualelementscheduler.md), [ICustomStyle](/engine/6000.6/script-reference/unityengine/uielements/icustomstyle.md)

```csharp
[Icon("UIToolkit/Icons/HelpBox.png")]
[UxmlElement(libraryPath = "Controls")]
public class HelpBox : VisualElement, IEventHandler, IResolvedStyle, ITransform, ITransitionAnimations, IExperimentalFeatures, IVisualElementScheduler, ICustomStyle
```

## Remarks

![UIElementsHelpBox (HelpBox)](/api/media?file=/engine/6000.6/media/images/UIElementsHelpBox.png)

## Examples

```csharp
public class HelpBoxExample : EditorWindow
{
    [MenuItem("Example/Help Box")]
    static void ShowWindow()
    {
        HelpBoxExample window = (HelpBoxExample)EditorWindow.GetWindow(typeof(HelpBoxExample));
        window.Show();
    }

    void OnEnable()
    {
        rootVisualElement.Add(new HelpBox("This is a help box", HelpBoxMessageType.Info));
    }
}
```

## Static Fields

| Value                                                                                                                        | Description                                                                                                                                                                   |
| ---------------------------------------------------------------------------------------------------------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| [bottomContainerUssClassName](/engine/6000.6/script-reference/unityengine/uielements/helpbox/bottomcontainerussclassname.md) | The USS class name for the bottom content container of this Elements type.                                                                                                    |
| [buttonUssClassName](/engine/6000.6/script-reference/unityengine/uielements/helpbox/buttonussclassname.md)                   | The USS class name for the action button of this Elements type.                                                                                                               |
| [iconErrorUssClassName](/engine/6000.6/script-reference/unityengine/uielements/helpbox/iconerrorussclassname.md)             | The USS class name for the [HelpBoxMessageType.Error](/engine/6000.6/script-reference/unityengine/uielements/helpboxmessagetype/error.md) state in Elements of this type.     |
| [iconInfoUssClassName](/engine/6000.6/script-reference/unityengine/uielements/helpbox/iconinfoussclassname.md)               | The USS class name for the [HelpBoxMessageType.Info](/engine/6000.6/script-reference/unityengine/uielements/helpboxmessagetype/info.md) state in Elements of this type.       |
| [iconUssClassName](/engine/6000.6/script-reference/unityengine/uielements/helpbox/iconussclassname.md)                       | The USS class name for images in Elements of this type.                                                                                                                       |
| [iconWarningUssClassName](/engine/6000.6/script-reference/unityengine/uielements/helpbox/iconwarningussclassname.md)         | The USS class name for the [HelpBoxMessageType.Warning](/engine/6000.6/script-reference/unityengine/uielements/helpboxmessagetype/warning.md) state in Elements of this type. |
| [labelUssClassName](/engine/6000.6/script-reference/unityengine/uielements/helpbox/labelussclassname.md)                     | The USS class name for labels in Elements of this type.                                                                                                                       |
| [linkUssClassName](/engine/6000.6/script-reference/unityengine/uielements/helpbox/linkussclassname.md)                       | The USS class name for the action link for this Elements type.                                                                                                                |
| [topContainerUssClassName](/engine/6000.6/script-reference/unityengine/uielements/helpbox/topcontainerussclassname.md)       | The USS class name for the top content container of this Elements type.                                                                                                       |
| [ussClassName](/engine/6000.6/script-reference/unityengine/uielements/helpbox/ussclassname.md)                               | The USS class name for Elements of this type.                                                                                                                                 |

## Constructors

| Constructor                                                                                                                                                                     | Description            |
| ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ---------------------- |
| [HelpBox()](/engine/6000.6/script-reference/unityengine/uielements/helpbox/ctor.md#helpbox\(\))                                                                                 | Creates a new HelpBox. |
| [HelpBox(System.String,UnityEngine.UIElements.HelpBoxMessageType)](/engine/6000.6/script-reference/unityengine/uielements/helpbox/ctor.md#helpbox\(string-helpboxmessagetype\)) | Creates a new HelpBox. |

## Properties

| Property                                                                                     | Description                      |
| -------------------------------------------------------------------------------------------- | -------------------------------- |
| [buttonText](/engine/6000.6/script-reference/unityengine/uielements/helpbox/buttontext.md)   | The action button's text value.  |
| [linkHref](/engine/6000.6/script-reference/unityengine/uielements/helpbox/linkhref.md)       | The hyperlink's reference value. |
| [linkText](/engine/6000.6/script-reference/unityengine/uielements/helpbox/linktext.md)       | The hyperlink's text value.      |
| [messageType](/engine/6000.6/script-reference/unityengine/uielements/helpbox/messagetype.md) | The type of message.             |
| [text](/engine/6000.6/script-reference/unityengine/uielements/helpbox/text.md)               | The message text.                |

## Events

| Member                                                                                               | Description                                           |
| ---------------------------------------------------------------------------------------------------- | ----------------------------------------------------- |
| [onButtonClicked](/engine/6000.6/script-reference/unityengine/uielements/helpbox/onbuttonclicked.md) | Callback triggered when the action button is clicked. |

## Inheritance

**Inherited Members:**

* [VisualElement.disabledUssClassName](/engine/6000.6/script-reference/unityengine/uielements/visualelement/disabledussclassname.md)
* [VisualElement.SetActivePseudoState(bool)](/engine/6000.6/script-reference/unityengine/uielements/visualelement/setactivepseudostate.md)
* [VisualElement.SetCheckedPseudoState(bool)](/engine/6000.6/script-reference/unityengine/uielements/visualelement/setcheckedpseudostate.md)
* [VisualElement.ReleaseResources()](/engine/6000.6/script-reference/unityengine/uielements/visualelement/releaseresources.md)
* [VisualElement.SendEvent(EventBase)](/engine/6000.6/script-reference/unityengine/uielements/visualelement/sendevent.md)
* [VisualElement.SetEnabled(bool)](/engine/6000.6/script-reference/unityengine/uielements/visualelement/setenabled.md)
* [VisualElement.MarkDirtyRepaint()](/engine/6000.6/script-reference/unityengine/uielements/visualelement/markdirtyrepaint.md)
* [VisualElement.IsMarkedForRepaint()](/engine/6000.6/script-reference/unityengine/uielements/visualelement/ismarkedforrepaint.md)
* [VisualElement.ContainsPoint(Vector2)](/engine/6000.6/script-reference/unityengine/uielements/visualelement/containspoint.md)
* [VisualElement.GetClasses()](/engine/6000.6/script-reference/unityengine/uielements/visualelement/getclasses.md)
* [VisualElement.GetClassNames()](/engine/6000.6/script-reference/unityengine/uielements/visualelement/getclassnames.md)
* [VisualElement.ClearClassList()](/engine/6000.6/script-reference/unityengine/uielements/visualelement/clearclasslist.md)
* [VisualElement.AddToClassList(string)](/engine/6000.6/script-reference/unityengine/uielements/visualelement/addtoclasslist.md#addtoclasslist\(string\))
* [VisualElement.AddToClassList(UniqueStyleString)](/engine/6000.6/script-reference/unityengine/uielements/visualelement/addtoclasslist.md#addtoclasslist\(uniquestylestring\))
* [VisualElement.AddToClassList(string, string)](/engine/6000.6/script-reference/unityengine/uielements/visualelement/addtoclasslist.md#addtoclasslist\(string-string\))
* [VisualElement.AddToClassList(UniqueStyleString, UniqueStyleString)](/engine/6000.6/script-reference/unityengine/uielements/visualelement/addtoclasslist.md#addtoclasslist\(uniquestylestring-uniquestylestring\))
* [VisualElement.AddToClassList(string\[\])](/engine/6000.6/script-reference/unityengine/uielements/visualelement/addtoclasslist.md#addtoclasslist\(string\))
* [VisualElement.AddToClassList(UniqueStyleString\[\])](/engine/6000.6/script-reference/unityengine/uielements/visualelement/addtoclasslist.md#addtoclasslist\(uniquestylestring\))
* [VisualElement.AddToClassList(ReadOnlySpan\<UniqueStyleString>)](/engine/6000.6/script-reference/unityengine/uielements/visualelement/addtoclasslist.md#addtoclasslist\(readonlyspanuniquestylestring\))
* [VisualElement.RemoveFromClassList(string)](/engine/6000.6/script-reference/unityengine/uielements/visualelement/removefromclasslist.md#removefromclasslist\(string\))
* [VisualElement.RemoveFromClassList(UniqueStyleString)](/engine/6000.6/script-reference/unityengine/uielements/visualelement/removefromclasslist.md#removefromclasslist\(uniquestylestring\))
* [VisualElement.ToggleInClassList(string)](/engine/6000.6/script-reference/unityengine/uielements/visualelement/toggleinclasslist.md#toggleinclasslist\(string\))
* [VisualElement.ToggleInClassList(UniqueStyleString)](/engine/6000.6/script-reference/unityengine/uielements/visualelement/toggleinclasslist.md#toggleinclasslist\(uniquestylestring\))
* [VisualElement.EnableInClassList(string, bool)](/engine/6000.6/script-reference/unityengine/uielements/visualelement/enableinclasslist.md#enableinclasslist\(string-bool\))
* [VisualElement.EnableInClassList(UniqueStyleString, bool)](/engine/6000.6/script-reference/unityengine/uielements/visualelement/enableinclasslist.md#enableinclasslist\(uniquestylestring-bool\))
* [VisualElement.ClassListContains(string)](/engine/6000.6/script-reference/unityengine/uielements/visualelement/classlistcontains.md#classlistcontains\(string\))
* [VisualElement.ClassListContains(UniqueStyleString)](/engine/6000.6/script-reference/unityengine/uielements/visualelement/classlistcontains.md#classlistcontains\(uniquestylestring\))
* [VisualElement.FindAncestorUserData()](/engine/6000.6/script-reference/unityengine/uielements/visualelement/findancestoruserdata.md)
* [VisualElement.SetBinding(BindingId, Binding)](/engine/6000.6/script-reference/unityengine/uielements/visualelement/setbinding.md)
* [VisualElement.GetBinding(BindingId)](/engine/6000.6/script-reference/unityengine/uielements/visualelement/getbinding.md)
* [VisualElement.TryGetBinding(BindingId, Binding)](/engine/6000.6/script-reference/unityengine/uielements/visualelement/trygetbinding.md)
* [VisualElement.GetBindingInfos()](/engine/6000.6/script-reference/unityengine/uielements/visualelement/getbindinginfos.md#getbindinginfos\(\))
* [VisualElement.GetBindingInfos(List\<BindingInfo>)](/engine/6000.6/script-reference/unityengine/uielements/visualelement/getbindinginfos.md#getbindinginfos\(listbindinginfo\))
* [VisualElement.HasBinding(BindingId)](/engine/6000.6/script-reference/unityengine/uielements/visualelement/hasbinding.md)
* [VisualElement.ClearBinding(BindingId)](/engine/6000.6/script-reference/unityengine/uielements/visualelement/clearbinding.md)
* [VisualElement.ClearBindings()](/engine/6000.6/script-reference/unityengine/uielements/visualelement/clearbindings.md)
* [VisualElement.GetHierarchicalDataSourceContext()](/engine/6000.6/script-reference/unityengine/uielements/visualelement/gethierarchicaldatasourcecontext.md)
* [VisualElement.GetDataSourceContext(BindingId)](/engine/6000.6/script-reference/unityengine/uielements/visualelement/getdatasourcecontext.md)
* [VisualElement.TryGetDataSourceContext(BindingId, DataSourceContext)](/engine/6000.6/script-reference/unityengine/uielements/visualelement/trygetdatasourcecontext.md)
* [VisualElement.TryGetLastBindingToUIResult(BindingId, BindingResult)](/engine/6000.6/script-reference/unityengine/uielements/visualelement/trygetlastbindingtouiresult.md)
* [VisualElement.TryGetLastBindingToSourceResult(BindingId, BindingResult)](/engine/6000.6/script-reference/unityengine/uielements/visualelement/trygetlastbindingtosourceresult.md)
* [VisualElement.Add(VisualElement)](/engine/6000.6/script-reference/unityengine/uielements/visualelement/add.md)
* [VisualElement.Insert(int, VisualElement)](/engine/6000.6/script-reference/unityengine/uielements/visualelement/insert.md)
* [VisualElement.Remove(VisualElement)](/engine/6000.6/script-reference/unityengine/uielements/visualelement/remove.md)
* [VisualElement.RemoveAt(int)](/engine/6000.6/script-reference/unityengine/uielements/visualelement/removeat.md)
* [VisualElement.Clear()](/engine/6000.6/script-reference/unityengine/uielements/visualelement/clear.md#clear\(\))
* [VisualElement.Clear(VisualElementClearOptions)](/engine/6000.6/script-reference/unityengine/uielements/visualelement/clear.md#clear\(visualelementclearoptions\))
* [VisualElement.ElementAt(int)](/engine/6000.6/script-reference/unityengine/uielements/visualelement/elementat.md)
* [VisualElement.IndexOf(VisualElement)](/engine/6000.6/script-reference/unityengine/uielements/visualelement/indexof.md)
* [VisualElement.Children()](/engine/6000.6/script-reference/unityengine/uielements/visualelement/children.md)
* [VisualElement.Sort(Comparison\<VisualElement>)](/engine/6000.6/script-reference/unityengine/uielements/visualelement/sort.md)
* [VisualElement.BringToFront()](/engine/6000.6/script-reference/unityengine/uielements/visualelement/bringtofront.md)
* [VisualElement.SendToBack()](/engine/6000.6/script-reference/unityengine/uielements/visualelement/sendtoback.md)
* [VisualElement.PlaceBehind(VisualElement)](/engine/6000.6/script-reference/unityengine/uielements/visualelement/placebehind.md)
* [VisualElement.PlaceInFront(VisualElement)](/engine/6000.6/script-reference/unityengine/uielements/visualelement/placeinfront.md)
* [VisualElement.RemoveFromHierarchy()](/engine/6000.6/script-reference/unityengine/uielements/visualelement/removefromhierarchy.md)
* [VisualElement.GetFirstOfType\<T>()](/engine/6000.6/script-reference/unityengine/uielements/visualelement/getfirstoftype.md)
* [VisualElement.GetFirstAncestorOfType\<T>()](/engine/6000.6/script-reference/unityengine/uielements/visualelement/getfirstancestoroftype.md)
* [VisualElement.Contains(VisualElement)](/engine/6000.6/script-reference/unityengine/uielements/visualelement/contains.md)
* [VisualElement.FindCommonAncestor(VisualElement)](/engine/6000.6/script-reference/unityengine/uielements/visualelement/findcommonancestor.md)
* [VisualElement.AddMeshModifier(MeshModificationCallback, bool, int)](/engine/6000.6/script-reference/unityengine/uielements/visualelement/addmeshmodifier.md)
* [VisualElement.ClearMeshModifiers()](/engine/6000.6/script-reference/unityengine/uielements/visualelement/clearmeshmodifiers.md)
* [VisualElement.RemoveMeshModifier(MeshModificationCallback)](/engine/6000.6/script-reference/unityengine/uielements/visualelement/removemeshmodifier.md)
* [VisualElement.userData](/engine/6000.6/script-reference/unityengine/uielements/visualelement/userdata.md)
* [VisualElement.disablePlayModeTint](/engine/6000.6/script-reference/unityengine/uielements/visualelement/disableplaymodetint.md)
* [VisualElement.scaledPixelsPerPoint](/engine/6000.6/script-reference/unityengine/uielements/visualelement/scaledpixelsperpoint.md)
* [VisualElement.layout](/engine/6000.6/script-reference/unityengine/uielements/visualelement/layout.md)
* [VisualElement.contentRect](/engine/6000.6/script-reference/unityengine/uielements/visualelement/contentrect.md)
* [VisualElement.paddingRect](/engine/6000.6/script-reference/unityengine/uielements/visualelement/paddingrect.md)
* [VisualElement.worldBound](/engine/6000.6/script-reference/unityengine/uielements/visualelement/worldbound.md)
* [VisualElement.localBound](/engine/6000.6/script-reference/unityengine/uielements/visualelement/localbound.md)
* [VisualElement.worldTransform](/engine/6000.6/script-reference/unityengine/uielements/visualelement/worldtransform.md)
* [VisualElement.hasActivePseudoState](/engine/6000.6/script-reference/unityengine/uielements/visualelement/hasactivepseudostate.md)
* [VisualElement.hasInactivePseudoState](/engine/6000.6/script-reference/unityengine/uielements/visualelement/hasinactivepseudostate.md)
* [VisualElement.hasHoverPseudoState](/engine/6000.6/script-reference/unityengine/uielements/visualelement/hashoverpseudostate.md)
* [VisualElement.hasCheckedPseudoState](/engine/6000.6/script-reference/unityengine/uielements/visualelement/hascheckedpseudostate.md)
* [VisualElement.hasEnabledPseudoState](/engine/6000.6/script-reference/unityengine/uielements/visualelement/hasenabledpseudostate.md)
* [VisualElement.hasDisabledPseudoState](/engine/6000.6/script-reference/unityengine/uielements/visualelement/hasdisabledpseudostate.md)
* [VisualElement.hasFocusPseudoState](/engine/6000.6/script-reference/unityengine/uielements/visualelement/hasfocuspseudostate.md)
* [VisualElement.hasRootPseudoState](/engine/6000.6/script-reference/unityengine/uielements/visualelement/hasrootpseudostate.md)
* [VisualElement.name](/engine/6000.6/script-reference/unityengine/uielements/visualelement/name.md)
* [VisualElement.enabledSelf](/engine/6000.6/script-reference/unityengine/uielements/visualelement/enabledself.md)
* [VisualElement.viewDataKey](/engine/6000.6/script-reference/unityengine/uielements/visualelement/viewdatakey.md)
* [VisualElement.pickingMode](/engine/6000.6/script-reference/unityengine/uielements/visualelement/pickingmode.md)
* [VisualElement.tooltip](/engine/6000.6/script-reference/unityengine/uielements/visualelement/tooltip.md)
* [VisualElement.usageHints](/engine/6000.6/script-reference/unityengine/uielements/visualelement/usagehints.md)
* [VisualElement.languageDirection](/engine/6000.6/script-reference/unityengine/uielements/visualelement/languagedirection.md)
* [VisualElement.dataSourceType](/engine/6000.6/script-reference/unityengine/uielements/visualelement/datasourcetype.md)
* [VisualElement.resourcesReleased](/engine/6000.6/script-reference/unityengine/uielements/visualelement/resourcesreleased.md)
* [VisualElement.enabledInHierarchy](/engine/6000.6/script-reference/unityengine/uielements/visualelement/enabledinhierarchy.md)
* [VisualElement.visible](/engine/6000.6/script-reference/unityengine/uielements/visualelement/visible.md)
* [VisualElement.generateVisualContent](/engine/6000.6/script-reference/unityengine/uielements/visualelement/generatevisualcontent.md)
* [VisualElement.dataSource](/engine/6000.6/script-reference/unityengine/uielements/visualelement/datasource.md)
* [VisualElement.dataSourcePath](/engine/6000.6/script-reference/unityengine/uielements/visualelement/datasourcepath.md)
* [VisualElement.experimental](/engine/6000.6/script-reference/unityengine/uielements/visualelement/experimental.md)
* [VisualElement.hierarchy](/engine/6000.6/script-reference/unityengine/uielements/visualelement/hierarchy-1.md)
* [VisualElement.parent](/engine/6000.6/script-reference/unityengine/uielements/visualelement/parent.md)
* [VisualElement.panel](/engine/6000.6/script-reference/unityengine/uielements/visualelement/panel.md)
* [VisualElement.contentContainer](/engine/6000.6/script-reference/unityengine/uielements/visualelement/contentcontainer.md)
* [VisualElement.visualTreeAssetSource](/engine/6000.6/script-reference/unityengine/uielements/visualelement/visualtreeassetsource.md)
* [VisualElement.this\[int\]](/engine/6000.6/script-reference/unityengine/uielements/visualelement/item.md)
* [VisualElement.childCount](/engine/6000.6/script-reference/unityengine/uielements/visualelement/childcount.md)
* [VisualElement.schedule](/engine/6000.6/script-reference/unityengine/uielements/visualelement/schedule.md)
* [VisualElement.style](/engine/6000.6/script-reference/unityengine/uielements/visualelement/style.md)
* [VisualElement.resolvedStyle](/engine/6000.6/script-reference/unityengine/uielements/visualelement/resolvedstyle.md)
* [VisualElement.customStyle](/engine/6000.6/script-reference/unityengine/uielements/visualelement/customstyle.md)
* [VisualElement.styleSheets](/engine/6000.6/script-reference/unityengine/uielements/visualelement/stylesheets.md)
* [Focusable.Blur()](/engine/6000.6/script-reference/unityengine/uielements/focusable/blur.md)
* [Focusable.focusable](/engine/6000.6/script-reference/unityengine/uielements/focusable/focusable.md)
* [Focusable.tabIndex](/engine/6000.6/script-reference/unityengine/uielements/focusable/tabindex.md)
* [Focusable.delegatesFocus](/engine/6000.6/script-reference/unityengine/uielements/focusable/delegatesfocus.md)
* [CallbackEventHandler.RegisterCallback\<T>(EventCallback\<T>, TrickleDown)](/engine/6000.6/script-reference/unityengine/uielements/callbackeventhandler/registercallback.md)
* [CallbackEventHandler.RegisterCallbackOnce\<T>(EventCallback\<T>, TrickleDown)](/engine/6000.6/script-reference/unityengine/uielements/callbackeventhandler/registercallbackonce.md)
* [CallbackEventHandler.RegisterCallback\<T, U>(EventCallback\<T, T>, T, TrickleDown)](/engine/6000.6/script-reference/unityengine/uielements/callbackeventhandler/registercallback.md)
* [CallbackEventHandler.RegisterCallbackOnce\<T, U>(EventCallback\<T, T>, T, TrickleDown)](/engine/6000.6/script-reference/unityengine/uielements/callbackeventhandler/registercallbackonce.md)
* [CallbackEventHandler.RegisterCallback\<T>(EventCallback\<T>, CallbackOptions)](/engine/6000.6/script-reference/unityengine/uielements/callbackeventhandler/registercallback.md)
* [CallbackEventHandler.RegisterCallback\<T, U>(EventCallback\<T, T>, T, CallbackOptions)](/engine/6000.6/script-reference/unityengine/uielements/callbackeventhandler/registercallback.md)
* [CallbackEventHandler.UnregisterCallback\<T>(EventCallback\<T>, TrickleDown)](/engine/6000.6/script-reference/unityengine/uielements/callbackeventhandler/unregistercallback.md)
* [CallbackEventHandler.UnregisterCallback\<T, U>(EventCallback\<T, T>, TrickleDown)](/engine/6000.6/script-reference/unityengine/uielements/callbackeventhandler/unregistercallback.md)
* [CallbackEventHandler.UnregisterCallback\<T>(EventCallback\<T>, CallbackOptions)](/engine/6000.6/script-reference/unityengine/uielements/callbackeventhandler/unregistercallback.md)
* [CallbackEventHandler.UnregisterCallback\<T, U>(EventCallback\<T, T>, CallbackOptions)](/engine/6000.6/script-reference/unityengine/uielements/callbackeventhandler/unregistercallback.md)
* [CallbackEventHandler.UnregisterAllRemovableCallbacks()](/engine/6000.6/script-reference/unityengine/uielements/callbackeventhandler/unregisterallremovablecallbacks.md)
* [CallbackEventHandler.HasTrickleDownHandlers()](/engine/6000.6/script-reference/unityengine/uielements/callbackeventhandler/hastrickledownhandlers.md)
* [CallbackEventHandler.HasBubbleUpHandlers()](/engine/6000.6/script-reference/unityengine/uielements/callbackeventhandler/hasbubbleuphandlers.md)
* [CallbackEventHandler.HandleEventBubbleUp(EventBase)](/engine/6000.6/script-reference/unityengine/uielements/callbackeventhandler/handleeventbubbleup.md)
* [CallbackEventHandler.HandleEventTrickleDown(EventBase)](/engine/6000.6/script-reference/unityengine/uielements/callbackeventhandler/handleeventtrickledown.md)
* [CallbackEventHandler.NotifyPropertyChanged(BindingId)](/engine/6000.6/script-reference/unityengine/uielements/callbackeventhandler/notifypropertychanged.md)