如何利用Skyline6.1实现多球对比功能

直接看代码：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using TerraExplorerX;

namespace Multi3DDemo
{
    public partial class Form1 : Form
    {
        private SGWorld61 mainSGWorld;
        private SGWorld61 MainSGWorld
        {
            get
            {
                if (mainSGWorld == null)
                    mainSGWorld = new SGWorld61Class();
                return mainSGWorld;
            }
        }

        private SGWorld61 sgworldEx;
        private SGWorld61 SGWorldEx
        {
            get
            {
                if (sgworldEx == null)
                {
                    sgworldEx = (SGWorld61)axTE3DWindowEx1.CreateInstance("TerraExplorerX.SGWorld61");
                }
                return sgworldEx;
            }
        }

        public Form1()
        {
            InitializeComponent();
        }

        private void toolStripButton1_Click(object sender, EventArgs e)
        {
            OpenFileDialog dialog = new OpenFileDialog();
            dialog.Filter = "Fly文件(*.fly)|*.fly|Mpt文件(*.mpt)|*.mpt";
            if (dialog.ShowDialog() == System.Windows.Forms.DialogResult.Cancel)
                return;

            MainSGWorld.Project.Open(dialog.FileName, true);
        }

        private void toolStripButton2_Click(object sender, EventArgs e)
        {
            OpenFileDialog dialog = new OpenFileDialog();
            dialog.Filter = "Fly文件(*.fly)|*.fly|Mpt文件(*.mpt)|*.mpt";
            if (dialog.ShowDialog() == System.Windows.Forms.DialogResult.Cancel)
                return;

            SGWorldEx.Project.Open(dialog.FileName, true);
        }

        private void toolStripButton3_Click(object sender, EventArgs e)
        {
            MainSGWorld.Application.Multiple3DWindows.SetAsLeader();

            MainSGWorld.Application.Multiple3DWindows.LinkPosition(SGWorldEx);
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }
    }
}