how to expand and collapse rows in datatable

[ravi krishna muthireddy]

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">
<hutputText value="View Details" />
</f:facet>
<t:column>
<f:facet name="header">
<tutputText value="#{msg['msg.description']}" />
</f:facet>
<tutputText value="#{prjs.description}" />
</t:column>
<t:column>
<f:facet name="header">
<tutputText value="#{msg['msg.location']}" />
</f:facet>
<tutputText 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>
<tutputText value="Title" />
</t:column>
<t:column>
<tutputText 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>
<tutputText value="Title" />
</t:column>
<t:column>
<tutputText 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">
<tutputLabel value="first" />
</f:facet>
<f:facet name="last">
<tutputLabel value="last" />
</f:facet>
<f:facet name="previous">
<tutputLabel value="previous" />
</f:facet>
<f:facet name="next">
<tutputLabel 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.