How do I un-link the selection of two separate comboboxes which bind to the same object?

Question

I have two seperate WPF Comboboxes both of them bind to the same object to populate their values. However, when I change the selection in one combobox, the selection in the other combobox is changed to the same as the first, and vice versa. This is not the behavior I want, I want only want to bind the content of the comboboxes to a single source without mirroring their selections. I am binding to a BindingList.To bind I use

ItemsSource="{Binding}"

and

comboBox1.DataContext = bindingList;

What do I need to do to unlink the selections of these two comboboxes?

Answer 1

The way these actually work bind the scenes is by wrapping the collection in an instance of ICollectionView, which maintains the current selected item (amongst other things).

To get the behaviour you want, just set the DataContext of each combo box to:

new ListCollectionView(bindingList);