TabContainer 不显示问题

<div class="ajax__tab_xp" id="TabContainer1" style="visibility:hidden;">
 <div id="TabContainer1_header">
  <span id="__tab_TabContainer1_TabPanel1">
                    第一个
                </span><span id="__tab_TabContainer1_TabPanel2">
                    第二个
                </span><span id="__tab_TabContainer1_TabPanel3">
                    第三个
                </span>
 </div><div id="TabContainer1_body">
  <div id="TabContainer1_TabPanel1" style="display:none;visibility:hidden;">

  </div><div id="TabContainer1_TabPanel2" style="display:none;visibility:hidden;">

  </div><div id="TabContainer1_TabPanel3" style="display:none;visibility:hidden;">

  </div>
 </div>

但是在前台是不能显示的.

上面的隐藏样试是从那里设置的?