protected virtual void OnSelectedChanged(EventArgs e)
{
this.Invalidate();
this.Update();
if (PopupMenu != null)
{
PopupMenu.Left = this.Parent.Left + this.Left;
PopupMenu.Top = this.Parent.Top + this.Top + this.Height;
PopupMenu.Visible = Selected;
PopupMenu.BringToFront();
if (OnPopup != null)
{
OnPopup(PopupMenu, new EventArgs());
}
}
}