Hi Stefan,
I'm using VS to create the template for me (see App.xaml), and I would prefer this method if it is reliable. I successfully got the drag and drop functionality in the RadListBox, but still can't get the PropertyGrid to update when selecting an item in the RadListBox. I wish I could upload my project.
I tried to add the drag and drop behavior to your sample project but the list ended up empty. Also, when I opened up your project I got a Telerik notice that I was using an out of date version. FYI: I am using the 2016.2.613.45 (Trial) version.
