PiccoloActionFactory.getSemanticExitAction(semanticLayer);
PiccoloActionFactory.getOverlayExitAction(semanticLayer);
    private void initActions(BrowserModel targetModel)    {        // theoretically shouldn't happen        if(targetModel == null)        {            return;        }                defaultTDownActions = new MouseDownActions();        defaultTOverActions = new MouseOverActions();                selectThumbnailAction =            PiccoloActionFactory.getSelectThumbnailAction(targetModel);                defaultTDownActions.setMouseClickAction(PiccoloModifiers.NORMAL,                                                selectThumbnailAction);        defaultTDownActions.setMouseClickAction(PiccoloModifiers.POPUP,                                                PiccoloActions.POPUP_MENU_ACTION);                semanticLayer = new SemanticLayer();        semanticHoverThumbnailAction =            PiccoloActionFactory.getSemanticEnterAction(semanticLayer);                    semanticExitThumbnailAction =            PiccoloActionFactory.getSemanticExitAction(semanticLayer);                    defaultTOverActions.setMouseEnterAction(PiccoloModifiers.NORMAL,                                                semanticHoverThumbnailAction);        defaultTOverActions.setMouseExitAction(PiccoloModifiers.NORMAL,                                               semanticExitThumbnailAction);            }