Event after modifying polygon in Google Maps API v3

I solved it by calling .getPath() and putting the listener inside the listener which is called every time a shape is clicked. I think the Google API documentation is not very clear on how to use the set_at so it may be useful for other people too.

// Add an event listener that selects the newly-drawn shape when the user
// mouses down on it.
var newShape = e.overlay;
newShape.type = e.type;
google.maps.event.addListener(newShape, 'click', function() {
    google.maps.event.addListener(newShape.getPath(), 'set_at', function() {
        console.log("test");
    });

    google.maps.event.addListener(newShape.getPath(), 'insert_at', function() {
        console.log("test");
    });
    setSelection(newShape);
});