void Instance_GraduationPlanDeleted(object sender, DeleteGraduationPlanEventArgs e)
 {
     tabControl2.Visible = false;
     _SelectButton       = null;
     foreach (GraduationPlanInfo var in _InfoDictionary.Keys)
     {
         if (var.ID == e.ID)
         {
             itemPanel1.Items.Remove(_InfoDictionary[var]);
             _InfoDictionary.Remove(var);
             break;
         }
     }
 }
 void Instance_GraduationPlanDeleted(object sender, DeleteGraduationPlanEventArgs e)
 {
     tabControl2.Visible = false;
     _SelectItem         = null;
     foreach (GraduationPlanInfo var in _InfoDictionary.Keys)
     {
         if (var.ID == e.ID)
         {
             RemoveAdvTreeItem(e.ID);
             _InfoDictionary.Remove(var);
             break;
         }
     }
 }