C# / WPF - BindingList<T> containing and maintaining the contents of a HashSet<BindingList<T>>

I want a master BindingList<T> which contains a reference to all the items in child lists and开发者_Python百科

Does this already exist or should I create one? I guess it would be an AggregatedBindingList<T> which would have a constructor;

public AggregatedBindingList<T>(IEnumerable<BindingList<T> items)

And methods;

public bool AddBindingList(BindingList<T> list);
public bool RemoveBindingList(BindingList<T> list);

Where I'd hook into the Add/Remove/Clear change events and update the master accordingly.

My data structure is not too dissimilar to the below if we imagine each as a BindingList (the count is displayed) and Inhabitants are only added to the leaf lists but I want to maintain the root correctly.

GB - 1050
       |- England  - 230
       |- Wales    - 200
       |- Scotland - 620

I'm sure I can write something but this must have been done before, no?