Is there a way for dhtmlx to load XML that has been marked up with resource links, like @Resources.UserID on all label, text etc. fields? Or do I need to specify the entire XML string in the Resources .resx files?
Components are fully client side, so they will not be able to call any extra code to localize text in xml. You can use any server side script, to process data before sending to client side and localize data in the necessary way.