Safari Mobile And The Use of History Tokens

I recently created a mobile application using gwt with the MVP pattern along with a valueChangeHandler that invokes the onValueChange method when the History Token changes.  There are 3 ways that my application updates the history token. 

1) Defining the token within the html like in the following example: <a href="#newToken">link</a>

2) Creating a clickHandler that generates an new token:

addClickHandler(new ClickHandler() {

@Override

public void onClick(ClickEvent event) {

History.newItem("newToken");

}

});

3) Creating a clickHandler that directs to the previous token

addClickHandler(new ClickHandler() {

@Override

public void onClick(ClickEvent event) {

History.back();

}

});

The problem I am having is that when a user clicks a link within mobile safari which opens the iphone mail client (ie, <a href="mailto:username@gmail.com"></a>), then returns to the application by either sending the email or clicking cancel, then the back button within my application (ie, History.back() ) no longer invokes the onValueChange method.  Interestingly, the history token appended to the end of the url does update when the 'back' button is clicked, and both options 1 and 2 above still invoke the onValueChangeMethod.  Has anyone dealt with a similar issue or could someone explain why Safari Mobile seemingly ignores the History state after returning from the mail client?

Thanks

Daniel  

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