Here’s project scenario, editable collection view bound to a list box, upon selecting an item it populates the Data Form control (in my testing I tried the Silverlight toolkit and the Telerik Rad controls.) On the list I have a CollectionViewSource filter method.
What would happen, if you would place the form into edit mode, then execute the filter method you will get an error that filter cannot be done while in AddNew or Edit mode.
To solve this you can detect if the collection is in one of those modes and either confirm or cancel the changes.
if (MyCollection is IEditableCollectionView) { var MyCollectView = MyCollection.View as IEditableCollectionView; if (MyCollectView.IsAddingNew) { MyCollectView.CommitNew(); } if (MyCollectView.IsEditingItem) { MyCollectView.CommitEdit(); } }
Research ~ A ~ holic 
Thanks for your share, I encountered on DataForm and recently on a DataGrid. And we do not need to Refresh a filter or sorting for each property.
PropertyChangedEventHandler filter = (sen, arg) => {
if(typeof(ICheckableItem).GetProperties().ToList().Select(pi=>pi.Name).Contains(arg.PropertyName))
Filter();
};
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