private void barButtonItem_HinhThuc_ItemClick(object sender, ItemClickEventArgs e)
{
if (formHinhThucSuDung == null)
{
formHinhThucSuDung = new F_Main_HinhThucSuDung();
formHinhThucSuDung.MdiParent = this;
formHinhThucSuDung.FormClosed += new FormClosedEventHandler(formHinhThucSuDung_FormClosed);
formHinhThucSuDung.Show();
}
else
{
formHinhThucSuDung.Activate();
}
}
void formHinhThucSuDung_FormClosed(object sender, FormClosedEventArgs e)
{
formHinhThucSuDung = null;
}
