Starting with version 11.2.5 you can make use of the built-in IDCTreeNode domain component.
A good example of its usage can be found at "%Public%\Documents\DevExpress 2011.2 Demos\eXpressApp Framework\XCRM\CS\DomainComponents.XCRM\ICategory.cs".
For the details of its implementation, refer to the "%Program Files%\DevExpress 2011.2\eXpressApp Framework\Sources\DevExpress.Persistent\DevExpress.Persistent.Base\DC\ITreeNode.cs" file.
This will be fully described in the respective documentation in the future.
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