So far i do not believe we have not tested whether or not the themes provided by Microsoft or any other third party for that matter affect our controls. In theory they should not be affected as the the theme itself does not support them but the use of standard controls like TextBox and TextBlock could potentially be affected. That being said could you please send me the sample you were using in your original post, so we can debug it and resolve any issues related to that.
On a side note we do have plans on providing a Jet Pack-ish theme for our controls, although we have not yet decided on any specifics on when it will be available.
Waiting for your sample.
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