private void izdatnicaToolStripMenuItem_Click(object sender, EventArgs e)
        {
            frmDodajIzdatnicu izdatnica = new frmDodajIzdatnicu();

            izdatnica.MdiParent = this;
            izdatnica.Show();
        }
 private void izdatnicaToolStripMenuItem_Click(object sender, EventArgs e)
 {
     frmDodajIzdatnicu izdatnica = new frmDodajIzdatnicu();
     izdatnica.MdiParent = this;
     izdatnica.Show();
 }