reRender on click of RadioButton shows Blank Page

[bansi]

I am unable to reRender the values on the  click of RadioButton . It shows
blank page
Here is the code snippet
[code]
        <div style="overflow:auto; width:85%; height:125px">    
                                
            <h:dataTable id="deviceDetailTable"  styleClass="list" 
rowClasses="odd,even" 
                         value="#{updateDeviceBean.tableRows}" 
var="vartableRow"                                         
                         >
                 
                 <h:column id="column1">
                                        <a4j:region>    
                                <t:selectOneRadio id="interfaceId"
value="#{updateDeviceBean.deviceInterface.id}" >        
                                                                                
                                                                        
                                                   <f:selectItem itemLabel="" 
itemValue="#{vartableRow.id}" />
                                                   <a4j:support
action="#{updateDeviceBean.loadDeviceInterfaceDetails}" event="onclick"  
reRender="interfacePanel" />  
                                </t:selectOneRadio>
                                <h:message for="interfaceId" />
                                </a4j:region>
                        </h:column>
                 
                
<h:column/>
<h:column/>
</h:dataTable>  
                        
                </div>




<a4j:outputPanel id="interfacePanel" >
                           <h:panelGrid columns="3" styleClass="detail" 
columnClasses="label"> 
                                        
                                       <h:outputLabel><h:outputText  
value="MAC" />
</h:outputLabel>
                                                                        
<h:inputText  id="mac"
value="#{updateDeviceBean.deviceInterface.mac}" />
                                                            <h:message 
for="mac" />
                                        
                        
                                                                   
<h:outputLabel> <h:outputText value="Status" />
</h:outputLabel>
                                                                    
<h:selectOneMenu id="status"
value="#{updateDeviceBean.interfaceStatus}"  >
                                                                                
<f:selectItem itemLabel="" itemValue="" />               
                                                                                
 <f:selectItems
value="#{updateDeviceBean.interfaceStatusList}" />                              
 
                                                                    
</h:selectOneMenu> 
                                                                    <h:message 
for="status" />  
                                                </h:panelGrid>
                           </a4j:outputPanel> 
[/code]

Any pointers/suggestions will be highly appreciated

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