public static void ItemZIndexChanged(ItemViewModel item)
 {
     ItemViewModel.ItemZIndexChangeOccurred(null, item);
 }
 public static void ItemSelected(ItemViewModel item)
 {
     ItemViewModel.ItemSelectionChanged(null, item);
 }
 public static void ItemDeleted(ItemViewModel item)
 {
     ItemViewModel.ItemDeletionOccurred(null, item);
     ItemViewModel.ItemSelectionChanged(null, null);
 }
 public static void ItemAdded(ItemViewModel item)
 {
     ItemViewModel.ItemAdditionOccurred(null, item);
     ItemViewModel.ItemSelectionChanged(null, item);
 }