Assembly: PresentationCore (in presentationcore.dll)
XML Namespace: http://schemas.microsoft.com/winfx/2006/xaml/presentation
Property Valuetrue if the size and position of layout are valid; otherwise, false.
You can force arrangement to be invalidated by calling InvalidateArrange on this element (or its parents). This flags the layout for recomposition at such time as the layout system determines. Alternatively, an immediate call to UpdateLayout could be made, but this should only be done if it is certain that no further invalidations are pending (a large number of unnecessarily forced updates has performance consequences).
IsArrangeValid cannot be true unless IsMeasureValid is also true (in the layout process, arrangement cannot be valid without measurement first being valid).
Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter EditionThe Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.