private void OnRaiseCanExecuteChanges(RaiseCanExecuteChangesEventArgs e)
 {
     if (e.Sender is IPaneViewModel)
     {
         RaiseCanExecuteChanges();
     }
 }
 private void OnRaiseCanExecuteChanges(RaiseCanExecuteChangesEventArgs e)
 {
     if (e.Sender is IPaneViewModel) RaiseCanExecuteChanges();
 }