private void CalculateTabStops ()
{
if (use_tabstops) {
#if NET_2_0
if (use_custom_tab_offsets) {
float[] f = new float[custom_tab_offsets.Count];
custom_tab_offsets.CopyTo (f, 0);
StringFormat.SetTabStops (0, f);
}
else
#endif
StringFormat.SetTabStops (0, new float[] { (float)(Font.Height * 3.7) });
} else
StringFormat.SetTabStops (0, new float[0]);
this.Invalidate ();
}