Increase number of row on a table with action button

I was trying to recreate the first two screens from the activity from “It’s a graph party!” webinar (link to activity below). Table starts with one row then subsequently increases with each push of action button. I tried something like maxRows:button1.pressCount, but my table starts with no rows for input until button is pressed. I want my table to start with one row, then subsequently increse rows with the action button.

maxRows: numericValue("${button1.pressCount}+1")