private void pENERIMAANToolStripMenuItem_Click(object sender, EventArgs e)
        {
            if (penerimaan == null)
            {
                penerimaan = new Form_PENERIMAAN();

                penerimaan.FormClosed += new FormClosedEventHandler(formpenerimaan);
                penerimaan.Show();
            }
            else
            {
                penerimaan.Activate();
            }
        }
 void formpenerimaan(Object sender, FormClosedEventArgs e)
 {
     penerimaan = null;
 }