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AutoCompleteBox.DropDownOpening Event

Silverlight

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 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.

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.

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