I'm not sure what makes the sample complex for you; the MVVM pattern, the quick-start framework..? In any case, it's fairly simple to quickly mock up a mindmap:
- define some shapes and add them to the diagram
- connect the shape you want; things don't have to be connected as a tree but if you wish a standard mindmap you should do so (the mindmap layout will also work with non-tree graphs).
- apply a tree-layout with subtype set to horizontal or vertical mindmap (other settings are available)
The attached sample does not use MVVM or anything complex and I also avoided to customize things with control template or style. I hope to helps you on the right track.
the Telerik team