Place change dynamically

I have a place that change dynamically but these changes are not reflected in the URL.

In the activity, a place with information is launched, but the mapper (CachingActivityMapper) needs to put other information, then I tried this code in the Mapper:

        this.eventBus.addHandler( PlaceChangeEvent.TYPE, new PlaceChangeEvent.Handler() {

            @Override

            public void onPlaceChange( PlaceChangeEvent event ) {

                Place newPlace = event.getNewPlace();

                if ( newPlace instanceof PlaceTrace ) {

                    ((PlaceTrace)newPlace).setPosition( CachingCenterActivityMapper.getKeyPosition() );

                }

            }

        } );

but the handler is called after writing the URL.

Any suggestions?

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