Select First row in a table

Hi,
I have a page with two tables - Master-Detail. Upon first load of the page, I would like the first row in the master table got selected automatically, and so the detail table is displayed with the corresponding data for the master. I have implemented similar page before, and the first row always got selected automatically. But not sure why, for this page, none of the rows in the table got selected upon first load of the page. I have to manually highlight a row in the master table, then the detail table will display the corresponding data.
Any ideas?
Thanks.
-Mina

Yes, I did set the partial trigger. That's why when manually select the row on the master table, the detail table get refreshed. The problem is the first time entering the page, and not row get selected automatically in the master table. Here is the code snipplet of the detail table:
<af:table value="#{bindings.ItasLookupCodesVO1.collectionModel}"
var="row" rows="#{bindings.ItasLookupCodesVO1.rangeSize}"
emptyText="#{bindings.ItasLookupCodesVO1.viewable ? 'No data to display.' : 'Access Denied.'}"
fetchSize="#{bindings.ItasLookupCodesVO1.rangeSize}"
rowBandingInterval="0"
filterModel="#{bindings.ItasLookupCodesVO1Query.queryDescriptor}"
queryListener="#{bindings.ItasLookupCodesVO1Query.processQuery}"
filterVisible="true" varStatus="vs"
selectedRowKeys="#{bindings.ItasLookupCodesVO1.collectionModel.selectedRow}"
selectionListener="#{bindings.ItasLookupCodesVO1.collectionModel.makeCurrent}"
rowSelection="single" id="t2" partialTriggers=":::pc1:t1"
editingMode="clickToEdit" summary="Lookup Codes">
The table is a child of a panelCollection.
Any more ideas?
Thanks.
-Mina

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