# PopulateToolbar(OverridableToolbar, List<string>)

> Overrides the contents of built-in toolbars.

## Definition

* **Type:** Method
* **Namespace:** [UnityEditor.Toolbars](/engine/6000.6/script-reference/unityeditor/toolbars.md)
* **Assembly:** UnityEditor.CoreModule

```csharp
void PopulateToolbar(OverridableToolbar toolbarType, List<string> elements)
```

### Parameters

**** (\[OverridableToolbar]\(/engine/6000.6/script-reference/unityeditor/toolbars/overridabletoolbar)): The built-in toolbar to override.**** (\[List\<string>]\(https\://learn.microsoft.com/dotnet/api/system.collections.generic.list-1)): List of the built-in toolbar's default element IDs.

### Remarks

This method is called before populating contents of built-in toolbars that support overriding. Use toolbarType to check which toolbar this method is called for. Change  the elements list to remove or reorder the built-in elements,  or add the [EditorToolbarElementAttribute](/engine/6000.6/script-reference/unityeditor/toolbars/editortoolbarelementattribute.md) IDs of custom elements.

### Examples

```csharp
using System.Collections.Generic;
using UnityEditor;
using UnityEditor.EditorTools;
using UnityEditor.Toolbars;

[EditorTool("Custom Tool")]
public class CustomTool : EditorTool { }

[CustomEditor(typeof(CustomTool))]
public class CustomToolSettings : Editor, IOverrideToolbar
{
    public void PopulateToolbar(OverridableToolbar toolbarType, List<string> elements)
    {
        switch (toolbarType)
        {
            case OverridableToolbar.ToolSettings:
                // Add a custom button at the end of the Scene view's 'Tool Settings' toolbar
                elements.Add(CustomToolSettingsButton.k_ID);
                break;

            case OverridableToolbar.ViewOptions:
                // Remove '2D' and 'Audio' buttons from the Scene view's 'View Options' toolbar
                elements.Remove("SceneView/2D");
                elements.Remove("SceneView/Audio");
                break;
        }
    }
}

[EditorToolbarElement(k_ID)]
public class CustomToolSettingsButton : EditorToolbarButton
{
    public const string k_ID = "Custom Tool/Settings Button";
    CustomToolSettingsButton() { text = "SB"; }
}
```