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RadSplitButtonDropDownOpening Event
Occurs when the Popup will be opened. If the event handler set True for the Handled property then the Popup doesn't open.

Namespace: Telerik.Windows.Controls
Assembly: Telerik.Windows.Controls (in Telerik.Windows.Controls.dll) Version: 2017.3.1018.40 (2017.3.1018.40)
Syntax
public event RoutedEventHandler DropDownOpening

Value

Type: System.WindowsRoutedEventHandler
See Also