When I use a:commandButton calling bean action rerender of components is working fine, but when I call pageflow action entire page is reloaded instead of rerender of particular component

example
calling bean action, everything is OK
JSP

<a:commandButton
 image="/slike/ikone/trazi.png"
 action="#{traziOperater.trazi}"
 title="#{messages['zajednicke.trazi']}"
 reRender="tablica" />

<r:dataTable
 id="tablica"
 var="v"
 value="#{traziOperater.rezultati}">
...
</r:dataTable>

<a:commandButton
 image="/slike/ikone/trazi.png"
 action="trazi"
 title="#{messages['zajednicke.trazi']}"
 reRender="tablica" />
<r:dataTable
 id="tablica"
 var="v"
 value="#{traziOperater.rezultati}">
...
</r:dataTable>

<start-page
 name="operater"
 view-id="/core/maticni/operater/PregledOperater.jsp"
 timeout="3600000">
 <redirect />
 <description>
 #{messages['maticni.operater.pregled']}
 </description>
 <transition name="trazi" to="trazenjeDecision" />
</start-page>

<decision
 name="trazenjeDecision"
 expression="#{traziOperater.trazi}">
 <transition name="OK" to="operater" />
 <transition name="NOT" to="operater" />
</decision>