model.moveToBack();
if (model != null) model.moveToBack();
    public void execute()    {        if (model != null) {            ImageDisplay selectedDisplay = model.getBrowser().                                                    getSelectedDisplay();            hierarchyObject = (DataObject) selectedDisplay.getHierarchyObject();        }        if (hierarchyObject == null) return;        //post a show properties event.        model.moveToBack(); //move the window to the back.        EventBus eventBus = HiViewerAgent.getRegistry().getEventBus();        eventBus.post(new ShowProperties(hierarchyObject, ShowProperties.EDIT));     }