利用这个Button类中的SetMenu（）可以代替菜单，也可以设置按钮按下和起来的状态，使按钮呈现动态效果，另一个重点就是它没有内存泄露问题。-Button to take this category SetMenu () can replace the menu, you can set up the button press and the state, so that dynamic effects of a button, and the other key point is it does not have memory leak problems.