The Frame class adds to the history tokens every time I change the URL, how can I stop that?

I noticed that a certain page would appear many times in the 'go back' history tokens. After some digging I found out that the cause is the class 'Frame', specifically every time  I change the URL like this:

videoFrame.setUrl(url);

the tokens would increase with the same current page! Which is very annoying. I tried to stop the LoadEvent like this:

private HandlerRegistration handler;

handler = videoFrame.addLoadHandler(new LoadHandler() {

@Override

public void onLoad(LoadEvent event) {

handler.removeHandler();

}

});

With no luck what so ever. I tried other things but I got no where.

Any help?

Thanks

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