Ok, I think you are referring to this line:
<transitions:TransitionPresenter Grid.Column="1" x:Name="MainImageBorder" TransitionSelector="{Binding ImageTransitionSelector}" Content="{Binding ImageView}" VerticalAlignment="Top" />
I've tried to replace it by:
<Image Source="{Binding Path=ActiveGame.FrontImagePath}" />
But it shows nothing (no image). I don't understand exactly when you say "When in Game Details you'd want to make that invisible"
Sorry for being so noob. I really appreciate your help.