I have a CarCollection that inherits CollectionBase. I add the items in a Car Class to a combobox and to the Collection. I have a MakeCurrent button that makes the selectedindex in the combobox the current Car. When I run a method in the application that increases the Mileage (among other things) on the Current Car in the Collection the values(like MIleage) do not update. Only the last item in the combobox list will update.