Component binding property problem

Question

following problem:
I have a form where I built a dataTable with a dynamic number of columns. To achieve this, I used a component binding (backing bean) to dynamically add columns.
The form is used for different kind of queries and every query has it's own number of columns. The query-identification is submitted via a request parameter.
All the data in the query-form are o.k. (bean values) but the backing bean will not be called in case of a new request (same jsf-form, but other request-parameter).
example:
http://host/url.faces?id=1
http://host/url.faces?id=2
<h:dataTable id="test"
             value="#{test.values}"
             var="i"
             rendered="true"
             binding="#{test.table}">
</h:dataTable>whereas test is a bean which is created in a servlet listener and also updated with the corresponding id from the request.
The table-property depends on the id given in the request.
why ?

Answer 1

ok, I found out, that using the <h:commandLink> with a param-tag solves this issue.
Now the backing-bean's method to build the table is all-time called.
And it works even after an expired session.
But unfortunately I do not really know, why it works this way and the other it doesn't...