You can find more information why import from .trdx into .NET class is not supported in the following forum thread: Import a trdx file from Report Designer into VS2012
All the best,
the Telerik team
See what's new in Telerik Reporting Q1 2013. Register for the March 4 webinar to witness the impressive new visualizations in Telerik Reporting. Just for fun, 10 webinar attendees will be randomly selected to win a Telerik T-shirt and a $50 Gift Certificate to ThinkGeek. Register now! Seats are limited!