MouseDown implementation

  Boolean
  MouseDown( TMouseDownEvent& mouseDown )
  {
      TGPoint selection( mouseDown.GetEventPosition() );
      GlobalToLocal( selection  );
  
      TGraphicIterator* iterator = fWagon->CreateIterator();
      MGraphic* aGraphic = iterator->First();
  
      while (aGraphic)
      {
          TGRect bounds( fWagon->GetGeometricBounds() );
          if ( bounds.Contains( selection ) )
              qprintf( "Selected\n" );
          else        
              qprintf( "not selected\n" );
              aGraphic = iterator->Next();
      }
  
      iterator->Reset();
      
      Invalidate();
      
          return( TRUE);
  }