I am currently using WAB Dev 2.12 and am looking to change the default marker from a black dot to hollow. I was able to partially do this. On line 374, I changed the SimpleMarkerSymbol from 'Style_SOLID' to 'Style_NULL. This did make my marker a hollow fill but I still have a black circle (with a hollow fill). I've been playing around with this section for quite a while now and have been unable to successfully hollowing out the outline as well. Any help would be greatly appreciated.