public void MiddleSelected(params string[] dependants)
 {
     if (MiddleModel.SelectedIndex <= 0)
     {
         BottomModel.clear();
     }
     else
     {
         BottomModel.bind(dependants);
     }
     setFeedback();
 }
 public void TopSelected(params string[] dependants)
 {
     if (TopModel.SelectedIndex <= 0)
     {
         MiddleModel.clear();
     }
     else
     {
         MiddleModel.bind(dependants);
     }
     BottomModel.clear();
     setFeedback();
 }
 private void clearAll()
 {
     TopModel.clear();
     MiddleModel.clear();
     BottomModel.clear();
 }