Occurs when changes occur that affect whether or not the command should execute.
Assembly: PresentationCore (in PresentationCore.dll)
Normally, a command source calls CanExecute on the command when this event occurs.
Normally, if the command cannot execute, the command source disables itself.
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.