private void btnAgregarRetiroPersonal_Click(object sender, EventArgs e)
        {
            var  pantalla = new frmNuevoRetiroPersonal();
            bool copia    = false;

            foreach (var frm in Parent.MdiChildren)
            {
                if (pantalla.Name == frm.Name)
                {
                    frm.Close();
                }
            }

            pantalla.Closed   += ApplicationTab_Closed;
            pantalla.Load     += PantallaOnLoad;
            pantalla.MdiParent = Parent;
            pantalla.Show();
        }
        private void btnAgregarRetiroPersonal_Click(object sender, EventArgs e)
        {
            var pantalla = new frmNuevoRetiroPersonal();
            bool copia = false;
            foreach (var frm in Parent.MdiChildren)
            {
                if (pantalla.Name == frm.Name)
                {
                    frm.Close();
                }
            }

            pantalla.Closed += ApplicationTab_Closed;
            pantalla.Load += PantallaOnLoad;
            pantalla.MdiParent = Parent;
            pantalla.Show();
        }