display.addControlListener(new DragControl());
display.addControlListener(new PanControl());
display.addControlListener(new ZoomControl());
display.addControlListener(new WheelZoomControl());
display.addControlListener(new ZoomToFitControl());
display.addControlListener(new NeighborHighlightControl());
// overview display
// Display overview = new Display(vis);
// overview.setSize(290,290);
// overview.addItemBoundsListener(new FitOverviewListener());