private void toolStripButton1_Click(object sender, EventArgs e)
{
if (CPO == null)
{
CPO = new CreatePurchaseOrder();
CPO.MdiParent = this;
CPO.FormClosed += new FormClosedEventHandler(CPO_FormClosed);
CPO.Show();
// this.Close();
}
else
{
CPO.Activate();
}
}
void CPO_FormClosed(object sender, FormClosedEventArgs e)
{
CPO = null;
}