public void actionPerformed(ActionEvent e) {
mPopupMenu.setVisible(true);
mPopupMenu.show(mMenuButton, 0, mMenuButton.getHeight());
}
public DefaultPopupMenuButtonAction(JPopupMenuButton aMenuButton, JPopupMenu aPopupMenu) {
mMenuButton = aMenuButton;
mPopupMenu = aPopupMenu;
mMenuButton.setPopupMenu(aPopupMenu);
}