C#

protected override void OnAfterSelect(TreeViewEventArgs e)
{
  //do your functions here
  base.OnAfterSelect(e);
}

<br />
  public class DropDownItem<br />
  {<br />
    private string szName="";<br />
<br />
    public DropDownItem() {<br />
      szName="DropDownItem1";<br />
    }<br />
<br />
    public string Name {<br />
      get {<br />
        return szName;<br />
      }<br />
      set {<br />
        szName=value;<br />
      }<br />
    }<br />
  }<br />
<br />
  public class DropDownCollection : CollectionBase <br />
  {<br />
    public DropDownCollection()  { }<br />
    <br />
    public virtual void Add(DropDownItem val) {<br />
      this.List.Add(val);<br />
    }<br />
  }

public class MyClass 
{
  DropDownCollection ddcol;

  public MyClass()
  {
    ddcol = new DropDownCollection();
  }

  public DropDownCollection DropDownItems 
  { get { return ddcol;} } //note, NO set property
}