动态增加的计算域怎么不显示
ls_calcstr='create compute(band=footer alignment="0" expression="sum( v_count )"border="0" color="33554432" x="658" y="28" height="60" width="590" format="[GENERAL]" html.valueishtml="0" name=compute_1 visible="1" font.face="宋体" font.height="-10" font.weight="400" font.family="0" font.pitch="2" font.charset="134" background.mode="2" background.color="1073741824" )'
dw_2.modify(ls_calcstr)
执行完后,在数据窗口怎么显示不了