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RadDropDownButtonElementDropDownOpening Event
Occurs when the drop-down is opening.

Namespace: Telerik.WinControls.UI
Assembly: Telerik.WinControls.UI (in Telerik.WinControls.UI.dll) Version: 2017.3.1017.40 (2017.3.1017.40)
Syntax
[BrowsableAttribute(true)]
public event CancelEventHandler DropDownOpening

Value

Type: System.ComponentModelCancelEventHandler
See Also