我想实现一个导航栏，就是点击第一个按钮时，另外两个按钮按从上到下的顺序排列在Panel的下端；
点击第二个按钮时，前两个按钮在上，第三个按钮在下。。。
但是我写的代码Dock的顺序总有问题！
不知道有没有大侠帮解决下？最好是用修改控件属性的，省的写代码！
多谢帮忙！
        private void button1_Click(object sender, EventArgs e)
        {
            this.panel1.Controls.Clear();
            button1.Dock = DockStyle.Top;
            button2.Dock = DockStyle.Bottom;
            button3.Dock = DockStyle.Bottom;
            this.panel1.Controls.Add(button1);
            this.panel1.Controls.Add(button2);
            this.panel1.Controls.Add(button3);
        }

        private void button2_Click(object sender, EventArgs e)
        {
            this.panel1.Controls.Clear();
            button1.Dock = DockStyle.Top;
            button2.Dock = DockStyle.Top;
            button3.Dock = DockStyle.Bottom;
            this.panel1.Controls.Add(button1);
            this.panel1.Controls.Add(button2);
            this.panel1.Controls.Add(button3);
        }

        private void button3_Click(object sender, EventArgs e)
        {
            this.panel1.Controls.Clear();
            button1.Dock = DockStyle.Top;
            button2.Dock = DockStyle.Top;
            button3.Dock = DockStyle.Top;
            this.panel1.Controls.Add(button1);
            this.panel1.Controls.Add(button2);
            this.panel1.Controls.Add(button3);
        }