Hi Alex Olenev,
You have to edit the default control template of the RadTreeViewItem
via Blend or getting the XAML from the Themes subfolder of your RadControls` installation folder. Then you have to remove/replace the Image in the Template control with Path, or add a Path in the place you wish to be displayed. You could elaborate more on your scenario ( a sample picture would be great) so that we could advice you better. Thank you for your cooperation.
All the best,
the Telerik team
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