Hilite all schematic nets that do NOT have a user added property...

For a variety of reasons we have added a property to certain schematic nets, and now I want to hilite the nets that do NOT have this property. This property could exist in our top level schematic or down the signal chain in a lower level cell, it just depends on where the Designer chose to tag the net. Because of this I need to scan each net, throughout the hierarchy looking for this property, and if no property exists (at any level) then hilite it at the top level schematic. 

I found the schTraceNet function but don't fully understand the syntax to make it work. Below is what I have so far, but it doesn't work, and maybe the wrong direction. My thoughts are to set a userFlag to nil, scan through each net and if said property is found at any level of hierarchy change the userFlag=t and then hilite the net at the top level. Any tips are appreciated.

foreach(net cv~>signals
  userFlag=nil
  schTraceNet(?topCellView cv ?net net~>name ?traceCB 'rfLookForNetPropCB)
   when(userFlag
    geAddNetProbe(getCurrentWindow() list("y0" "drawing") net~>name)
   );when
);end foreach

procedure(rfLookForNetPropCB(netStruct)
 let(()
  when(car(car(netStruct->net~>allInstTerms~>net~>prop~>name)) == "netInfo"     ;netInfo is the user applied property I'm searching for
   printf("Found netInfo tag %L \n" car(car(netStruct->net~>allInstTerms~>net~>prop~>name)))
   userFlag=t
   printf("Setting user flag to true \n")
  );when
 );end let
);end proc