Elements with a larger value appear in the foreground with respect to elements with smaller values.
To place one element in the background with respect to all others, set this property to a value less than zero, leaving the value for all other elements at zero.
To place one element in the foreground with respect to all others, set this property to a value greater than zero, leaving the value for all other elements at zero.
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