private void barButtonItem3_ItemClick(object sender, DevExpress.XtraBars.ItemClickEventArgs e)
{
Form frm = this.checkExists(typeof(FormLL12));
if (frm != null)
{
frm.Activate();
}
else
{
FormLL12 f = new FormLL12(this);
f.MdiParent = this;
f.Show();
}
}
private void FormLenLop_Load(object sender, EventArgs e)
{
FormLL10 f10 = new FormLL10(this);
f10.MdiParent = this;
f10.Show();
FormLL11 f11 = new FormLL11(this);
f11.MdiParent = this;
f11.Show();
FormLL12 f12 = new FormLL12(this);
f12.MdiParent = this;
f12.Show();
f10.Activate();
}