Unfortunately this is a know issue and it is logged in our PITS
. Also the AssemblyMinifier at the moment cannot work with the new Telerik.Windows.Controls.Chart.dll as well.
But you can have a look at this blog post
that lists 5 ways to reduce the size of your XAP.
the Telerik team
Explore the entire Telerik portfolio by downloading the Ultimate Collection trial package. Get it now >>