void ShowBorders()
{
_showTimer.Stop();
if (!_visible)
{
_visible = true;
_left.Owner = ContentWindow;
_left.ShowNoActivate();
_top.Owner = ContentWindow;
_top.ShowNoActivate();
_right.Owner = ContentWindow;
_right.ShowNoActivate();
_bottom.Owner = ContentWindow;
_bottom.ShowNoActivate();
}
}