setDefaultBtn.addActionListener(new SetDefaultAction(controller));
    public void setController(GroupsTabController controller) {        this.controller = controller;        userList.setController(controller);        groupList.setController(controller);        saveBtn.addActionListener(new SaveAction(controller));        addGroupBtn.addActionListener(new GroupAction(GroupAction.ADD,                controller));        removeGroupBtn.addActionListener(new GroupAction(GroupAction.REMOVE,                controller));        addUserBtn                .addActionListener(new UserAction(UserAction.ADD, controller));        removeUserBtn.addActionListener(new UserAction(UserAction.REMOVE,                controller));        groupList.selectFirstGroup();    }