private void submenu_pelanggan_Click(object sender, EventArgs e)
{
if (plgn == null)
{
plgn = new FormPelanggan();
plgn.MdiParent = this;
//panggil void form close
plgn.FormClosed += new FormClosedEventHandler(plgn_FormClosed);
plgn.Show();
}
else
{
plgn.Activate();
}
}
void plgn_FormClosed(object sender, EventArgs e)
{
plgn = null;
}