ICommand CanExecuteChanged not updating

Question

I am trying for MVVM pattern basic level and got struck at ICommand CanExecute changed. I have XAML binding as follows:

Answer 1

You must have in your ICommand implementation some method like RiseCanExecuteChanged that fires the event CanExecuteChanged. Then every time that the selected item in the list changed, in your view model you execute the RaiseCanExecuteChanged from the command you want. Any way I suggest you to use any generic command, like the RelayCommand of GalaSoft MVVMLite library, or any implementation of DelegateCommand. Hope this helps...