Issue in Refreshing or filtering the property present in an object ,wherein the Object is present inside another Object using CollectionViewSource

Hi,

we are facing an Issue in Refreshing or filtering the property(A1) present in an object(A) ,wherein the Object(AA) is present inside another Object using CollectionViewSource.

Parent Object : AA

     Property in child object : A

             Property in  sub child : A1

parent object,child object  implemnets InotifyChanged.and we also use collectionchanged event.

Now, when AA.A.A1 property gets updated, the filter doesn't fire reason being the event is not fired. need your help .

Kind Regards

krishna