Read original post by Hermit Dave at Invoke IT Blog
Recently Gustavo Guerra posted a question on StackOverflow.com stating that behaviour of TextBlock was different on Windows Phone 7 and Windows Phone 8. If the Text is empty, WP7 renders TextBlock with Height set to 0. On WP8, it occupies full height.
I replied back stating that he should consider using a Converter for the same. Of course I had a similar issue with Cineworld app. The screenshot shows ratings & review screen I implemented – its almost a copy of Windows Phone Store ratings & review.