How to select row with a polymer template created with Vaadin designer

I have a polymer template created with vaadin designer. This contains a vaadin-grid with vaadin-grid-column elements to style all the cells like I want.

But I can’t find an example of how to make my rows selectable, nor can I find documentation of how to use @EventHandler to get the selected item in my Java code and do something with it. How can I get started if documentation/examples are missing basic functionality. Who can help me getting started?