I'm creating a ComboBox that contains a Dictionary<byte,string> (for ex.) and ClearSelectionbuttonVisibility = Visible.
It's all ok, but if I click on "Clear Selection", it gives me ad error (that I attached).
I had to declare my property SelectedItem as KeyValuePair<byte, string>.
Now, I think that the reason's error is that KeyValuePair<byte,string> is not nullable, then?
How can I do use Dictionary in this context?