Thank you for the provided link.
Currently, the RadTreeListView does not support column selection and that is why it does not have the CanUserSelectColumns property. I am assuming that there were some difficulties with the hierarchy structure and that is why the feature was only implemented for the RadGridView.
That said, if you only want to enable the column selection for non-hierarchy columns, I can suggest utilizing some methods residing in GridViewDataControl. I am attaching a sample project demonstrating what I have in mind.
Note, that the approach uses an internal property of GridViewDataControl, which it accesses using reflection. The methods of that class are exposed by the RadGridView, however the RadTreeListView does not expose them, since it does not support column selection. Additionally, note that the demonstrated approach is a customization and I have not tested it extensively on my end.
I hope you find this helpful.
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