IsDropDownOpen returns a value indicating whether the drop down is currently open. You can set this property to open or close drop down as well. If you set this property to true and the editor is not in edit mode, it will be put in edit mode.
You can also hook into DropDownOpened and DropDownClosed events to be notified when the drop-down is opened and closed.
Target Platforms: Windows 10, Windows 8.1, Windows 8, Windows 7, Windows Server 2012, 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