ขอตัวอย่างการใช้งาน vb multi select combobox หน่อยคับ

private void Form1_Load(object sender, EventArgs e)
{

   //dummy data for TreeView
   treeView4Combo1.Nodes.Add("Asian");
      treeView4Combo1.Nodes[0].Nodes.Add("Rahil");
      treeView4Combo1.Nodes[0].Nodes.Add("Majid");
      treeView4Combo1.Nodes[0].Nodes.Add("Fahad");
   treeView4Combo1.Nodes.Add("African");
      treeView4Combo1.Nodes[1].Nodes.Add("Sajid");
      treeView4Combo1.Nodes[1].Nodes.Add("Faisal");
   treeView4Combo1.Nodes.Add("Alien");
      treeView4Combo1.Nodes[2].Nodes.Add("Nadeem");


   multiSelect4Combo1.Items.Add("VB.net");
   multiSelect4Combo1.Items.Add("C#");
   multiSelect4Combo1.Items.Add("SQL-Server");
   multiSelect4Combo1.Items.Add("Oracle");
   multiSelect4Combo1.Items.Add("ASP.net");
   multiSelect4Combo1.Items.Add("Perl");

   //Assigning child controls to its respective combobox
   this.extCombo2.AddControl(treeView4Combo1);
   this.extCombo4.AddControl(multiSelect4Combo1);

   this.extCombo2.LoadChildControl();

   this.extCombo4.LoadChildControl();

}