How to change data in a list once it's been built?

I need to reread the entire data set from a server on click. How can I do this?

I thought it might be as easy as overwriting the .data property and refreshing, but this doesn’t work. See the snippet below for a broken example of what I’m trying to do:

http://webix.com/snippet/7eca32fc

Try parse():
http://webix.com/snippet/aa2b5d0a

Thanks!