private void linkLabel1_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e)
        {
            RubroForm rubroForm = new RubroForm();

            rubroForm.FormClosed += rubroForm_Form_Closed;
            rubroForm.ShowDialog();
        }
        private void metroGridRubro_CellContentDoubleClick(object sender, DataGridViewCellEventArgs e)
        {
            RubroForm frmrubro = new RubroForm();

            frmrubro.Rubro = int.Parse(metroGridRubro.CurrentRow.Cells["IdRubro"].Value.ToString());
            // frmcuenta.FormClosed += frmcuenta_FormClosed;
            frmrubro.FormClosed += rubroForm_Form_Closed;
            frmrubro.Show();
        }