解决Winform panel动态加载Form页面无法随着panel最大化的问题

/// <summary>
        /// 显示窗体 
        /// </summary>
        /// <param name="frm">要显示的窗体实例</param>
        private void ShowForm(Form frm)
        {
            frm.MaximizeBox = true;
            frm.TopLevel = false;
            frm.FormBorderStyle = FormBorderStyle.None;
            frm.BackColor = this.panel2_content.BackColor;
            frm.Dock = this.panel2_content.Dock;
            this.panel2_content.Controls.Clear();
            this.panel2_content.Controls.Add(frm);
            frm.Show();
        }

记录下使用过程。