UIElement.InvalidateArrange Method ()
Invalidates the arrange state (layout) for the element. After the invalidation, the element will have its layout updated, which will occur asynchronously unless subsequently forced by UpdateLayout.
Assembly: PresentationCore (in PresentationCore.dll)
Frequent calls to UpdateLayout have significant performance consequences. Therefore, avoid calling this method unless you absolutely require precise layout state for subsequent calls to other APIs in your code. An advanced scenario where you might call is if you are creating a PropertyChangedCallback for a dependency property that is not on a Freezable or FrameworkElement derived class that still influences the arrange pass of layout when it changes.or in particular to
Available since 3.0
Available since 2.0
Windows Phone Silverlight
Available since 7.0