Brilliant! Works a treat! thanks a lot! 
 For anyone else looking: 
  <searchTemplate> 
  
 index=main host=gridnames | fields $grid$ | dedup $grid$   
      
  <fieldset> 
  
      
       Select grid    
          
        <![CDATA[index="main" host=gridnames| fields gridnames | dedup gridnames]]>   
          
       testabooga    
      
    
						
					
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