private void PlaylistCanvas_SelectionChanged(object sender, NotifyCollectionChangedEventArgs e)
{
PlaylistViewModel vm = (PlaylistViewModel)DataContext;
switch (e.Action)
{
case NotifyCollectionChangedAction.Add:
vm.SelectItems(e.NewItems);
break;
case NotifyCollectionChangedAction.Remove:
vm.DeselectItems(e.OldItems);
break;
case NotifyCollectionChangedAction.Reset:
vm.ClearSelection();
break;
}
}