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AutoCompleteBox.OnDropDownOpening Method

Silverlight

Raises the DropDownOpening event.

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

protected virtual void OnDropDownOpening(
	RoutedPropertyChangingEventArgs<bool> e
)

The DropDownOpening event occurs when the IsDropDownOpen property is changing from false to true.

Raising an event invokes the event handler through a delegate. The OnDropDownOpening method also allows derived classes to handle the event without attaching a delegate. This is the preferred technique for handling the event in a derived class.

Notes to Inheritors

When overriding OnDropDownOpening in a derived class, be sure to call the base class’s OnDropDownOpening method so that registered delegates receive the event.

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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