The depth, or distance from the root UIElement containing everything within the scene, of this UIElement instance when it is part of the scene graph.
When the current instance is detached from a scene graph, this property returns -1.
Target Platforms: Windows 10, Windows 8.1, Windows 8, 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