Selecting rows with polymer grid

I have a polymer template created with vaadin designer. This contains a grid and I see the grid, the select column, all the data, rows, …
The data is populated by the model defined in my Java code.

Now I want to define a @EventHandler annnotated method to retrieve the selected/clicked row in the grid.

In my template I defined on-selected-items-changed on the grid.
If I have a @EventHandler annnotated method without parameters I see that the method is called twice. What parameters should be defined in order to retrieve the selected row model data?

I tried this but the method isn’t called

private void selectRow(@ModelItem RowDataDTO rowData) {
    System.out.println("Received the row data");