Note that this property is reset to False when the editor leaves edit mode. It's meant to be valid while the editor is in edit mode. When not in edit mode, this property will return False.
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