As we have replied you in the support ticket for this particular scenario you need to replace the ContentPresenter inside DefaultRadComboBoxItemTemplate with:
And DisplayMemberPath will work as expected. Or if you want to keep all the bindings inside and have it working correctly you can add the following line to the ContentPresenter setup:
Hope this helps.
TRY TELERIK'S NEWEST PRODUCT - EQATEC APPLICATION ANALYTICS for WPF.
Learn what features your users use (or don't use) in your application. Know your audience. Target it better. Develop wisely.
Sign up for Free application insights >>