protected override void AttachCore()
 {
     Test.Attach();
     if (Test.Value)
     {
         True.Attach();
     }
     else
     {
         False.Attach();
     }
 }
 private void TestChanged(object sender, EventArgs e)
 {
     if (!IsAttached)
     {
         return;
     }
     if (Test.Value)
     {
         True.Attach();
         False.Detach();
     }
     else
     {
         True.Detach();
         False.Attach();
     }
     Refresh();
 }