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RadMultiColumnComboBoxDropDownOpening Event
Occurs when the drop-down window is about to open.

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

Value

Type: Telerik.WinControls.UIRadPopupOpeningEventHandler
See Also