Thank you for contacting us. Unfortunately we do not have an event to notify you every time an item is checked/unchecked. There's a workaround though. Please refer to the attached project and let me know if it works for you. In the meantime, I'll add an item in our backlog and we'll do our best to provide an easier approach for the future versions of ListPicker.
TRY TELERIK'S NEWEST PRODUCT - EQATEC APPLICATION ANALYTICS for WINDOWS PHONE 7.
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