Gets or sets a value that indicates whether a window appears in the topmost z-order.
Assembly: PresentationFramework (in PresentationFramework.dll)
XMLNS for XAML: http://schemas.microsoft.com/winfx/2006/xaml/presentation, http://schemas.microsoft.com/netfx/2007/xaml/presentation
A window whose property is set to true appears above all windows whose properties are set to false.
In the group of windows that have property is set to true, the window that is currently activated is the topmost window. Likewise for the group of windows that have property is set to false.
You cannot set or get this property when a window is hosted in a browser.
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
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.