html5 drag & drop get underlying element which is a Google Map

I'm trying to drag a element onto a Google Map and then get the latitude and longitude of the drop-point on the Google Map.

I can drag an element onto the map but it seems I can't get the data of the Google Map in my drop-event.

Picture:

Code:

{{#draggable-dropzone class="draggableDropzone1" dropped="addGoogleMarker" setIsDragged="setIsDragged" }}
    <div class="map-view">
      {{g-maps mouseover="dragEndGoogleMap" selections=mySelectionsOptions lat=51.086080 lng=4.366330 zoom=12 markers=markers click="onMapEvent"}}
    </div>
{{/draggable-dropzone}}

The "addGoogleMarker" method gets fired but the "dragEndGoogleMap" doesn't. I tried various events defined on this page:

Events page of ember-cli-g-maps

None of them gets fired.

Does anyone have a solution for this problem?