ListView, GridView, generic Dictionary and sorting

Have a class TKey which implements IComparable<TKey>, IEquatable<TKey> and
overrides object.Equals(object obj).
A ListView named TheListView (XAML) (presenting using GridView) is bound to
a Dictionary<TKey, TValue> (where TValue is whatever business object).
I am not able to sort this list, anyone knows how to do ?
(the CollectionView that may be returned by
(CollectionView)CollectionViewSource.GetDefaultView(TheListView.DataContext)
does not support sorting)
(Of course I may use a SortedDictionary instead, but what if I want to sort
differently than the IComparable implementation of TKey dictates ?)