How do I access the parameters of the layout argument passed to CF as a struct

How do I access the  parameters of the layout argument (for example addTradeX) passed to CF as a struct

<cffunction name="rememberLayout" access="remote" returntype="Boolean">
  <cfargument name="layout" required="true" type="struct">

I passed the layout via flex remote object ie

    var layout:Object = new Object;
      layout.addTradeX = addTrade.x ;

myService.send(layout)

many thanks