DropDownComponent undoDD = new DropDownComponent(undoButton);
undoDD.setBorder(BorderFactory.createEmptyBorder(0, 0, 0, 2));
undoDD.setMaximumSize(new Dimension(44, 25));
undoDD.setPreferredSize(new Dimension(44, 25));
tb.add(undoDD);
UndoPopUpMenuModel undoModel = new UndoPopUpMenuModel(undoDD
.getPopupMenu(), historyBrowserInterface);
undoDD.getPopupMenu().setModel(undoModel);
// Redo
JButton redoButton = getButtonFactory().createJToolbarButton("RedoButton");