C#

private void tvTestTree_BeforeLabelEdit(object sender, System.Windows.Forms.NodeLabelEditEventArgs e)
{
	e.Node.EndEdit(true);
	TextBox MyEdit= new TextBox();
	Rectangle IRect = e.Node.Bounds;
	MyEdit.Location= new Point(IRect.X,IRect.Y);
	MyEdit.Width=IRect.Width+20;
	MyEdit.Height=IRect.Height;
	MyEdit.Text=e.Node.Text;
	tvTestTree.Controls.Add(MyEdit);
	//MyEdit.Show();
}

private void tvTestTree_BeforeLabelEdit(object sender,
System.Windows.Forms.NodeLabelEditEventArgs e)
{
	e.Node.EndEdit(true);
	TextBox MyEdit= new TextBox();
	Rectangle IRect = e.Node.Bounds;
	MyEdit.Location= new Point(IRect.X,IRect.Y);
	MyEdit.Width=IRect.Width+20;
	MyEdit.Height=IRect.Height;
	MyEdit.Text=e.Node.Text;
	tvTestTree.Controls.Add(MyEdit);
	//MyEdit.Show();
}

public class MyTreeView : TreeView
{
  private TextBox editBox;
  protected override void WndProc(ref Message m)
  {
    if (m.Msg == TVN_BEGINLABELEDIT)
    {
      IntPtr hWnd = SendMessage(this.Handle, TVN_BEGINLABELEDIT, 0, 0);
      if (hWnd != IntPtr.Zero)
        this.editBox = (TextBox)Control.FromHandle(hWnd);
    }
    else if (m.Msg == TVN_ENDLABELEDIT)
      this.editBox = null;
  }
  [DllImport("user32.dll")]
  private static extern IntPtr SendMessage(IntPtr hWnd, int msg, int wParam,
    int lParam);
  private const TVN_BEGINLABELEDIT = 0x10c5;
  private const TVN_ENDLABELEDIT = 0x10c4;
  private const TVM_GETEDITCONTROL = 0x110f;
}

public class myControl : System.Windows.Forms.UserControl
{
public myControl()
{
}
....

private void Control_Paint(object sender,PaintEventHandler e)
{
   //do drawing 
}
}

lbale1.Text = "Hello";