private void guardsSalaryScaleToolStripMenuItem_Click(object sender, EventArgs e)
        {
            frm_salary_scale_guards scales = new frm_salary_scale_guards();

            scales.ShowDialog();
        }
        private void btn_manage_scales_Click(object sender, EventArgs e)
        {
            frm_salary_scale_guards scales = new frm_salary_scale_guards();

            scales.ShowDialog();
        }