Thanks for your reply. I will try to describe my situation.
I have RadTreeListView bound to list of ItemViewModel. ItemViewModel represents the viewmodel of entity which is in some state and can have some child entities. ItemViewModel also contains IsExpanded property which is set during initialization as follows:
(entity.State == States.RUNNING && entity.Childs.Any())
So first time RadTreeListView is loaded I need some rows to be expanded according to their ViewModel IsExpanded property.
I expected to do this by setting binding between rows IsExpanded property and thier appropriated ViewModel IsExpanded property. Unfortunately this straightforward approach doesnt work. Is there some other way how it can be done?