Please take my apologizes if we did not met your expectations. We do our best to improve constantly everyday and feedback like yours are pushing us ahead.
Regarding your first concern you're absolutely right. We ship the examples with warnings which should have been avoided. Take my personal commitment that this will not happen again.
Now onto your second problem. We are already aware of this issue. It can be reproduced only in partially trusted XBAP scenarios like our online examples. Unfortunately the problem lies down into the .NET Framework itself and we have already reported it to Microsoft. They have confirmed it and promised to fix it for future service pack of the framework. Here is the connect link to the bug report: https://connect.microsoft.com/WPF/feedback/ViewFeedback.aspx?FeedbackID=471383&wa=wsignin1.0
Thanks again for your valuable feedback. It is taken to heart.
the Telerik team