There is too much space surrounding each panelBarItem. Anyone knows how to remove/reduce it?

 <h:panelGroup rendered="#{searchBean.currentGTNetSearch.searchResult.entitiesInResult}">
 <r:panelBar width="100%">
 <r:panelBarItem label="Search result">
 <h:panelGrid style="cellpadding:0;" columns="2">
 <r:panel bodyClass="inpanelBody">
 <f:facet name="header">
 <f:verbatim>List</f:verbatim>
 </f:facet>
 <f:verbatim>TODO: Insert tree here</f:verbatim>
 </r:panel>
 <r:panel>
 <f:facet name="header" >
 <f:verbatim>Details</f:verbatim>
 </f:facet>
 <f:verbatim>TODO: Insert three sections here:
 - text details
 - graph
 - map</f:verbatim>
 </r:panel>
 </h:panelGrid>
 </r:panelBarItem>
 <r:panelBarItem label="Summary">
 TODO: SUMMARY
 </r:panelBarItem>
 </r:panelBar>
 </h:panelGroup>