Is it possible to not display values on some rows?

I am attaching an image that shows better what I mean. http://prntscr.com/dgtb0q

Some parent rows have the min or sum of their children. Is it possible to not show these extra fields that are calculated by pivot?

Edit: I can see tis question is answered here http://forum.webix.com/discussion/comment/13064#Comment_13064