# Editor.AdvancedDropdownWidget.OnBuildItems

```csharp
System.Action<AdvancedDropdownItem> OnBuildItems { get; set; }
```

Called to (re)build the item tree. Receives [Editor.AdvancedDropdownWidget.RootItem](/api/Editor.AdvancedDropdownWidget/RootItem) after it has been cleared.

Declared in [Editor.AdvancedDropdownWidget](/api/Editor.AdvancedDropdownWidget).
Assembly: `Sandbox.Tools`.