Normally, when you run the Devexpress WinForm project, you will see the objects as predetermined. Like this:
How can I change the behavior of DevExpress? How can I apply TreeList instead of the default list from DevExpress? (Or in general, change the presentation of data corresponding to my wishes)
My project structure:
As far as I can see you're talking about the XAF ListView's customization. In order to accomplish the hierarchical representation, I suggest you review the guide Tree List Editors (Organize Hierarchical Data) and the example How to Use Tree List Editors to Display List Views.
In short, to display data in a tree-like structure, the ITreeNode interface should be implemented in the appropriate business classes.