Gets or sets a value that indicates whether a window appears in the topmost z-order. This is a dependency property.
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, Windows XP SP2, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003
The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.