internal override bool OnMenuKey ()
{
// Set ourselves active and select our first item
ToolStripManager.SetActiveToolStrip (this, true);
ToolStripItem tsi = this.SelectNextToolStripItem (null, true);
if (tsi == null)
return false;
if (tsi is MdiControlStrip.SystemMenuItem)
this.SelectNextToolStripItem (tsi, true);
return true;
}