why scrollableDataTable can't refresh tableData first time?

[ranyut]

I'm using richfaces 3.2
I used

<rich:scrollableDataTable ......>
<rich:column id="cfullname" sortable="true" rendered="#{pmzregBean.dispHideHosp}">
<f:facet name="header"><h:outputText id="c_1" value="Name" /></f:facet>
<h:outputText id="c_2" value="#{ghlist.cfullname}" rendered="#{pmzregBean.dispHideHosp}"/>
</rich:column>
.......
and want to refresh it at

<a4j:commandButton value="GO" action="#{pmzregBean.query}"
reRender="c_2" id="submit" />
when I click "GO" at the first time ,table is null , but when i click the header "Name" ,the table have data now!!
And then , when i query other data , the table hava new data ,it can refresh.

But why the first time haven't data ? and need click the header ??

[ilya_shaikovsky]

because reRendering of conditionally rendered elements isn't good idea at all. you should wrap the conditionally redered element with a4j:outputPanel for example and reRender this output panel. This limitation presents in our guide. You can't reRender elements that may not present in DOM.