Occurs when changes occur that affect whether or not the command should execute.
event EventHandler CanExecuteChanged
Normally, a command source calls CanExecute on the command when this event occurs.
Normally, if the command cannot execute, the command source disables itself.
Supported in: 4.6, 4.5, 4, 3.5, 3.0
.NET Framework Client Profile
Supported in: 4, 3.5 SP1
Portable Class Library
Supported in: Portable Class Library
Supported in: Windows Phone 8.1
Supported in: Windows Phone Silverlight 8.1
Supported in: Windows Phone Silverlight 8
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