private void Form1_Load(object sender, EventArgs e)
 {
     if (fr15 == null)
     {
         fr15           = new FormAnaSayfa();
         fr15.MdiParent = this;
         fr15.Show();
     }
 }
 private void BttnAnasayfa_ItemClick(object sender, DevExpress.XtraBars.ItemClickEventArgs e)
 {
     if (fr15 == null || fr15.IsDisposed)
     {
         fr15           = new FormAnaSayfa();
         fr15.MdiParent = this;
         fr15.Show();
     }
 }