Thank you for contacting us and for your interest in RadControls for Windows Phone.
We are planning to extend the SlideViewPictureSource to provide built-in support for loading pictures from the Isolated Storage as well as to support ImageSource instances directly. We will implement this functionality for the next Service Pack release of the tools - expected within a month.
Please find attached a simple application that demonstrates how your scenario may be currently implemented. The ImageSource passed is loaded from an embedded image but you may plug the logic that loads images from the file system there.
I hope this helps. Let me know if I can assist you further.
the Telerik team
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