Greyed out funnel chart JSViz Example


I applied the following JSViz Funnel in my dashboard and I successfully implemented it, nevertheless the colors appear to be grayed out when nothing is selected. I don't know if this is intentional or if I did something wrong, but either way, it'd be better if the colors appear normally at first, and then turn gray only if the rectangles are not part of the marking.

Does anyone know how to do achieve this or where I could start tweaking? I've tried changing some code in the markModel function without any luck.

Thanks in advance.