private void BtnSatisListesi_ItemClick(object sender, DevExpress.XtraBars.ItemClickEventArgs e)
 {
     if (fr17 == null || fr17.IsDisposed)
     {
         fr17           = new Formlar.FrmSatislar();
         fr17.MdiParent = this;
         fr17.Show();
     }
 }
 private void BtnSatisListesi_ItemClick(object sender, DevExpress.XtraBars.ItemClickEventArgs e)
 {
     Formlar.FrmSatislar fr = new Formlar.FrmSatislar();
     fr.MdiParent = this;
     fr.Show();
 }