// Supports two blog entries by Daniel Moth:
// http://www.danielmoth.com/Blog/2007/01/treeviewvista.html
//  AND
// http://www.danielmoth.com/Blog/2006/12/tvsexautohscroll.html

  public class TreeViewVista : System.Windows.Forms.TreeView
  {
    protected override System.Windows.Forms.CreateParams CreateParams
    {
      get
      {
        System.Windows.Forms.CreateParams cp = base.CreateParams;
        cp.Style |= NativeMethods.TVS_NOHSCROLL; // lose the horizotnal scrollbar

        return cp;
      }
    }

    protected override void OnHandleCreated(System.EventArgs e)
    {
      base.OnHandleCreated(e);

      // get style
      int dw = NativeMethods.SendMessage(this.Handle,
        NativeMethods.TVM_GETEXTENDEDSTYLE, 0, 0);

      // Update style
      dw |= NativeMethods.TVS_EX_AUTOHSCROLL;       // autoscroll horizontaly
      dw |= NativeMethods.TVS_EX_FADEINOUTEXPANDOS; // auto hide the +/- signs

      // set style
      NativeMethods.SendMessage(this.Handle,
        NativeMethods.TVM_SETEXTENDEDSTYLE, 0, dw);

      // little black/empty arrows and blue highlight on treenodes
      NativeMethods.SetWindowTheme(this.Handle, "explorer", null);
    }
  }