private void statisticsToolStripMenuItem_Click(object sender, EventArgs e)
 {
     if (_stats == null)
     {
         _stats = new FrmVoteStats {
             MdiParent = this
         };
         _stats.FormClosed += _stats_FormClosed;
         _stats.Show();
         _stats.StyleManager = StyleManager;
     }
     else
     {
         _stats.Activate();
         _stats.WindowState = FormWindowState.Normal;
     }
 }