public void mouseReleased(MouseEvent e){
  VisualizationViewer<?,?> vv=(VisualizationViewer<?,?>)e.getSource();
  down=null;
  vv.setCursor(Cursor.getPredefinedCursor(Cursor.DEFAULT_CURSOR));
}

public void mouseReleased ( MouseEvent e ) { VisualizationViewer < ? , ? > vv = ( VisualizationViewer < ? , ? > ) e . getSource ( ) ; down = null ; vv . setCursor ( Cursor . getPredefinedCursor ( Cursor . DEFAULT_CURSOR ) ) ; }
unset the ' down ' point and change the cursoe back to the system default cursor
