If the editor doesn't take focus when it is in edit mode then it may want to listens in to keystrokes while the owner retains focus.
The default implemenation returns the opposite of the CanFocus property.
Target Platforms: Windows 10, Windows 8.1, Windows 8, Windows 7, Windows Server 2012, 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