IsFocusWithinPropertyEx Field
The IsFocusWithin Extended Property. The value of this property is automatically set to true for the current focus target and its ancestors chain. The value of this property is cleared from the previous focus target and its ancestors chain (if any).
Target Platforms: Windows 11, Windows 10, Windows 7, Windows Server 2019, Windows Server 2016, Windows Server 2012 R2, Windows Server 2012, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later)