WebImage overlay = new WebImage ( loadIcon ( "small.png" ) );
TooltipManager.setTooltip ( overlay, "Overlay with tooltip", TooltipWay.trailing, 0 );
overlayPanel.addOverlay ( overlay, SwingConstants.TRAILING, SwingConstants.TOP );
overlayPanel.setComponentMargin ( 0, 0, 0, overlay.getPreferredSize ().width );
return new GroupPanel ( overlayPanel );
}