AutoCompleteBox.DropDownOpening Event

Microsoft Silverlight will reach end of support after October 2021. Learn more.

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)

Syntax

'Declaration
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.

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.