Authenication using Glassfish File Realm

<zk>
<window id="something" apply="myVeryControllerComposer" >
 <grid mode=@{shameonyou} >
	     <columns sizable="true">
	        <column/>
	     </columns>
	       <rows>
		<row  self="@{each='data'}">
		    <cell><label id="invID" value="@{data.getInvoiceID}"  /> </cell> 
 		    <cell>
                   <button  id="editInvoiceButton"  label="Edit" forward="onClick=onClickInvoiceEditButton()" >   <--- would like to hide/disable this button when "test2" is login
				  <custom-attributes invoiceSeqID="@{data.getInvoiceID}"/>
	                          <custom-attributes invoiceWaID="@{data.getEmp}"/>
	            </button> </cell>
		   </row>
		 </rows>
 </grid>
</window>
</zk>