Equivalent to javascript confirmdialog ind GWT

Hey together, 

I try about a day to find an equvalent to the javascript confirm-dialog. 

My problem is that when the user reload the webpage, he should get a dialog with a "Yes" and a "No" button where he can decide to only reload the page or to log off from the page. 

I found a jQueryUi Dialog but this dilog don't interrup the reload process. 

After this I found this Project but I can't call it from a native Method... 

Maybe someone of you know a solution ? 

Thanks in advance ;) 

Dominic 

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