Hey,

I noticed, that in your sample app, when e.g. in the DateTimePicker´s input page, the back button brings you to the previous page and not to the page, where the DateTimePicker is located.

I saw that you are using a Popup to display picker pages. This leads you to the problem, that you cannot override the apps BackPressed bahaviour.

I could not find anything in your controls to check the Popup-state nor to manually dismiss the popup.
In my oppinion, this makes all your picker controls unusable for Windows Phone, as closing the popup is the default WP behavour.
What is you take on this?

Best
Till