Gets or sets a value that indicates whether the submenu of the MenuItem is open.
Assembly: PresentationFramework (in PresentationFramework.dll)
The following example shows how to open a submenu of a MenuItem. In this example, the MenuItem called fileMenu contains a MenuItem called recentFiles that has a submenu. When fileMenu is opened, the SubmenuOpened event is raised and the FileMenu_Opened event handler opens the submenu of recentFiles.
Available since 3.0