When script load, how to set start item on index (ex. 20)

core-list.data = has 100 items in array
start at index 20

I try

ready: function() {
    this.$.list.scrollToItem(20);}

whit error result: *this.setScrollTop is not a function*

on *domReady* looks like some issue when scrolling up

*onClick* work perfect but I need set the index automatically when page 
load.

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