How to add tree node's tooltip when a TreeViewAdv control is WinForms Docking Manager or used in GroupBar control?

private void treeViewAdv1_MouseHover(object sender, EventArgs e)
{
    Point ptInTree = this.treeViewAdv1.PointToClient(new Point(MousePosition.X, MousePosition.Y));
    // Get the node at the point where mouse pointer is located
    TreeNodeAdv node = this.treeViewAdv1.GetNodeAtPoint(ptInTree);
    if (node!=null&&node.TextBounds.Contains(treeViewAdv1.PointToClient(Control.MousePosition)))
    {
       this.toolTip1.SetToolTip(this.treeViewAdv1, node.Text);
    }
    else
    {
       this.toolTip1.SetToolTip(this.treeViewAdv1, "");           
    }
}

Private Sub treeViewAdv1_MouseHover(sender As Object, e As EventArgs)
    Dim ptInTree As Point = Me.treeViewAdv1.PointToClient(New Point(MousePosition.X,         MousePosition.Y))
    ' Get the node at the point where mouse pointer is located
    Dim node As TreeNodeAdv = Me.treeViewAdv1.GetNodeAtPoint(ptInTree)
    If node IsNot Nothing AndAlso node.TextBounds.Contains(treeViewAdv1.PointToClient(Control.MousePosition)) Then
       Me.toolTip1.SetToolTip(Me.treeViewAdv1, node.Text)
    Else
       Me.toolTip1.SetToolTip(Me.treeViewAdv1, "")
   End If
End Sub