private void btn_kelimeSec_ItemClick(object sender, DevExpress.XtraBars.ItemClickEventArgs e)
 {
     if (KS == null)
     {
         KS             = new KelimeSec();//
         KS.MdiParent   = this;
         KS.FormClosed += KS_FormClosed;
         KS.Show();
     }
     else
     {
         KS.Activate();
     }
 }
 private void KS_FormClosed(object sender, FormClosedEventArgs e)
 {
     KS = null;
 }