A reference to a ComboBoxItem representing the item currently selected in the combobox's DropDownControl. If a null reference (Nothing in Visual Basic), an item is not selected.
Requirements
Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2