Dev的DocumentManager添加窗體

1.DocumentManager要設置自己的MdiParent屬性

2.主窗體設置IsMidContainer為True

3.要生成的窗體設置MdiParent為主窗體

4.正常創建窗體，然后就可以顯示..Show()

            Form formscene = new Form();
            formscene.Name = Guid.NewGuid() + "";
            formscene.Text = "test";
            formscene.Dock = DockStyle.Fill;
            formscene.MdiParent = this;
            formscene.Show();