You can have an Image in the HierarchicalDataTemplate if you want items from one level to have common Image. This approach is realized in the attached solution. If you want to have different images on every RadTreeViewItem, you can introduce an Uri property in your ViewModel pointing to an Image and bind it to the DefaultImageSrc property of the RadTreeViewItem via ContainerBindings. Please let us know if this helped you.
All the best,
Petar Mladenov
the Telerik team
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