}
IconButton allLeft = new IconButton("arrow-double-left");
allLeft.setHeight(18);
allLeft.setToolTip(tip);
allLeft.addListener(Events.Select, new Listener<ComponentEvent>() {
public void handleEvent(ComponentEvent be) {
List<D> sel = toField.getStore().getModels();
fromField.getStore().add(sel);
toField.getStore().removeAll();
}