Silverlight and XNA

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I'm coding a game, i used Silverlight with XNA
File -> New -> Project -> Windows Phone XAML and XNA App
In MainPage.xaml page I insert a Listbox control, it contain buttons

<<pre lang="xml">Grid x:Name="ContentPanel" Grid.Row="1" Margin="12,0,12,0">
            <ListBox>
                    <Button Height="100" Content="Change to game page" Click="Button_Click" />
                    <Button Height="100" Content="Change to game page" Click="Button_Click" />
                    <Button Height="100" Content="Change to game page" Click="Button_Click" />
                    <Button Height="100" Content="Change to game page" Click="Button_Click" />
                    <Button Height="100" Content="Change to game page" Click="Button_Click" />
                    <Button Height="100" Content="Change to game page" Click="Button_Click" />
                    <Button Height="100" Content="Change to game page" Click="Button_Click" />
                    <Button Height="100" Content="Change to game page" Click="Button_Click" />
                    <Button Height="100" Content="Change to game page" Click="Button_Click" />
                    <Button Height="100" Content="Change to game page" Click="Button_Click" />
                    <Button Height="100" Content="Change to game page" Click="Button_Click" />
                    <Button Height="100" Content="Change to game page" Click="Button_Click" />
                    <Button Height="100" Content="Change to game page" Click="Button_Click" />
                    <Button Height="100" Content="Change to game page" Click="Button_Click" />
                    <Button Height="100" Content="Change to game page" Click="Button_Click" />
                    <Button Height="100" Content="Change to game page" Click="Button_Click" />
            </ListBox>
</Grid></pre>

When i click any button, game navigate to GamePage.xaml page
if from GamePage.xaml page, I press Home button, after, i press Button to MainPage.xaml page,
and Scrol Listbox.
I click button, it not active
Press Back button, nothing happen :(
Please help me!</pre>