[xwiki-users] DBList and Custom Display

Hi guys, I have a class containing a property type DBList. The Query is something like this: SELECT idVarProp.value, CONCAT(codeVarProp.value, ' - ', naamVarProp.value, ' (', codeProdProp.value, ' - ', naamProdProp.value, ')') FROM etc. etc. This works fine if I use "displayView"; the CONCAT value is displayed on screen. I now want to use a custom displayer to access this CONCAT part. I guess I should have access to some kind of Map value, but I do not know how to get to it. Any ideas or is this not possible at all? Peter