//boton unidad de medidad
        private void tb_uni_inv_ButtonCustomClick(object sender, EventArgs e)
        {
            va_uni_dad = 1;
            inv003_01 obj = new inv003_01();

            o_mg_glo_bal.mg_ads000_03(obj, this);
        }
 //keydown unidad compra
 private void tb_uni_com_KeyDown(object sender, KeyEventArgs e)
 {
     if (e.KeyData == Keys.Up)
     {
         va_uni_dad = 3;
         inv003_01 obj = new inv003_01();
         o_mg_glo_bal.mg_ads000_03(obj, this);
     }
 }