private void comboesToolStripMenuItem_Click(object sender, EventArgs e)
{
QuanlyCombo quanlyCombo = new QuanlyCombo();
addForm(quanlyCombo);
}
private void btnQLCB_Click(object sender, EventArgs e)
{
QuanlyCombo quanlyCombo = new QuanlyCombo();
quanlyCombo.Show();
}