updating dataTable lose rows="5"

[samju]

i have a dataTable when updating the data model by adding more element to the
model List. The table get rendered but the no of rows increase to the max
elements of the List.

<t:dataTable var="result" headerClass="table-header"
        id="servertable" value="#{dialogScope.alist}" sortable="false"
                width="100%" rowClasses="list-row-odd,list-row-even"
                styleClass="PageTitle" preserveDataModel="false"
                renderedIfEmpty="true" rowId="#{result.id}"
                binding="#{Sworker.serverdata}" rows="5" >

what to do?
 Sam

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