AutoCompleteBox.DropDownOpening Event

Occurs when the value of the IsDropDownOpen property is changing from false to true.

Namespace:  System.Windows.Controls
Assembly:  System.Windows.Controls.Input (in System.Windows.Controls.Input.dll)


Public Event DropDownOpening As RoutedPropertyChangingEventHandler(Of Boolean)
public event RoutedPropertyChangingEventHandler<bool> DropDownOpening
<sdk:AutoCompleteBox DropDownOpening="eventhandler"/>


You can cancel this event by setting Cancel to true.

For more information about handling events, see Events Overview for Silverlight.

Version Information


Supported in: 5, 4, 3


For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.