// Draw the tree.
private void treePictureBox_Paint(object sender, PaintEventArgs e)
{
e.Graphics.SmoothingMode = SmoothingMode.AntiAlias;
e.Graphics.TextRenderingHint = TextRenderingHint.AntiAliasGridFit;
Root.DrawTree(e.Graphics, Brushes.LightBlue, Pens.Blue, Brushes.Black, treePictureBox.Font);
}
