ComboBox.OnDropDownOpened Method

Raises the DropDownOpened event.

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


Protected Overridable Sub OnDropDownOpened ( _
    e As EventArgs _
protected virtual void OnDropDownOpened(
    EventArgs e



The OnDropDownOpened 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 OnDropDownOpened in a derived class, make sure to call the base class’s OnDropDownOpened method so that registered delegates receive the event.

Version Information


Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0


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