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Silverlight Navigation - How to Override Back Button Behavior

I am trying to override the default browser behavior in Silverlight (v4). Each of my XAML pages has the ability to show options. I want these options to be hidden when the user clicks the back button, or navigate to the previous page if the options are not visible. The Silverlight frame seems to return back and forth points when the user navigates to the page with a new QueryString. Is there any other way to implement my scenario other than having to implement a request component for my ShowOptions property?

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PhoneApplicationPage class has a BackKeyPress event



BackKeyPress += MainPage_BackKeyPress;

private void MainPage_BackKeyPress(object sender, CancelEventArgs e)
    {
        e.Cancel = true;
        // do whatever you want
    }
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