public void addListener(MouseAdapter mouseAdapter) {
		int nbrOfMarkers = this.locationMarkers.size();
		for (int index = 0; index < nbrOfMarkers; index++) {
			AbstractJOverlayMarker marker = this.locationMarkers.get(index);
			if (marker.getMouseListeners().length == 0) {
				marker.addMouseListener(mouseAdapter);
			}
		}
	}