To get distinct values for sub levels we need to expand them - this can be very time consuming or even unexpected especially when you have load on demand for child items
What if I want to explicitly load all items? For example, if I'm not using load on demand?
I have tried to use the existing code, but the method GetDistinctValuesCore is internal :( I think that all that's needed is to use items from all levels, not just from the ItemsSource.
Can I use built-in mechanism toreceive distinct values from all items, not from the top leves ones? Can this feature be implemented in future releases? I have tried to add a feature request, but I get the following error: "An error occurred while processing your request".