private void startOverlayToolStripMenuItem_Click(object sender, EventArgs e)
 {
     if (m_overlay == null)
     {
         m_overlay = new GUIOverlay(m_statTracker);
         m_overlay.FormClosed += new FormClosedEventHandler(overlay_FormClosed);
         UpdateOverlay();
         m_overlay.Show(this);
     }
 }