private void personelUzerindekiDemirbasToolStripMenuItem_Click(object sender, EventArgs e)
 {
     if (formPerson == null)
     {
         formPerson             = new FormPersonelAramaDemirbas();
         formPerson.FormClosed += new FormClosedEventHandler(FormPerson_FormClosed);
         formPerson.MdiParent   = this;
         formPerson.Show();
     }
     else
     {
         formPerson.Activate();
     }
 }
 private void FormPerson_FormClosed(object sender, FormClosedEventArgs e)
 {
     formPerson = null;
 }