Hi Marcos Sampaio,
Yes, there the column is an ItemsControl and you can you can retrieve its sub-columns though the Items property.
Unfortunately with the official Q2 release the TreeListView will be based on the GridView, which means that subColumns will not be supported out-of-the-box but can be implemented:
http://blogs.telerik.com/pavelpavlov/posts/09-12-04/adding_additional_power_to_radgridview_for_silverlight_with_attached_behaviors.aspx
Best wishes,
Miroslav
the Telerik team
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