In this post, Joost van Schaik talks about a bindable Application Bar for your WP7 application.
Source: .NET by Example
I’ve said it once and I’ll say it again:
”Thou shalt not make unto thee any Windows Phone 7 application without MVVMLight”
Even when using Application Bar. I strikes me as very odd that people still use that thing for an excuse to bypass the model or even forego MVVM.