public virtual void RemoveOverlay(IOverlay overlay)
{
if (overlay == null)
return;
this.Overlays.Remove(overlay);
GlassPanelForm glassPanel = this.FindGlassPanelForOverlay(overlay);
if (glassPanel != null) {
this.glassPanels.Remove(glassPanel);
glassPanel.Unbind();
glassPanel.Dispose();
}
}