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how to expand and collapse rows in datatable

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hello every one,

i've table which displays students and their courses

course is sub table in students where only 5 records are visible when user clicks expand link remaining courses should be displayed for that student.

i've done that but when expand link is clicked all the students courses are
expanding.here is my code

<t:dataTable id="idsTable" rowIndexVar="row"
value="#{Bean.ids}" var="prj" border="1"
cellpadding="1" cellspacing="1" first="0" rows="5">
<f:facet name="header">
<h:outputText value="View Details" />
</f:facet>
<t:column>
<f:facet name="header">
<t:outputText value="#{msg['msg.description']}" />
</f:facet>
<t:outputText value="#{prjs.description}" />
</t:column>
<t:column>
<f:facet name="header">
<t:outputText value="#{msg['msg.location']}" />
</f:facet>
<t:outputText value="#{prj.location}" />
</t:column>
<t:column>
<tr>
<td colspan="12"><h:panelGrid
binding="#{Bean.gridPanel1}" rendered="true">
<t:dataTable id="Table" value="#{prj.ids}" var="bids"
border="2" cellpadding="2" cellspacing="2" first="0" rows="5">
<t:column>
<t:outputText value="Title" />
</t:column>
<t:column>
<t:outputText value="Notes" />
</t:column>
</t:dataTable>
<h:commandLink action="#{Bean.expandProjects}"
value="Expand Link" />

</h:panelGrid> <h:panelGrid binding="#{Bean.gridPanel2}"
rendered="false">
<t:dataTable id="Table1" value="#{prj.bids}" var="bids"
border="1" cellpadding="1" cellspacing="1" first="0">
<t:column>
<t:outputText value="Title" />
</t:column>
<t:column>
<t:outputText value="Notes" />
</t:column>
</t:dataTable>
<h:commandLink action="#{Bean.collapseProjects}"
value="Collapse Link" >
</h:commandLink>
</h:panelGrid></td>
</tr>
</t:column>
</t:dataTable>

<t:dataScroller id="scroller" for="Table" paginator="true"
fastStep="2" paginatorMaxPages="5"
paginatorActiveColumnStyle="fontsize:10px;font-weight:bold;"
immediate="true">
<f:facet name="first">
<t:outputLabel value="first" />
</f:facet>
<f:facet name="last">
<t:outputLabel value="last" />
</f:facet>
<f:facet name="previous">
<t:outputLabel value="previous" />
</f:facet>
<f:facet name="next">
<t:outputLabel value="next" />
</f:facet>
</t:dataScroller>

in this code ive used 2 grid panel one to displaying 5 rows and other displays compelete rows when expand is clicked

please could any one suggest me.
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