How to set ExpandoObject's dictionary as case insensitive?

I've been using this “Flexpando” class (for flexible expando) which is case-insensitive.

It's similar to Darin's MassiveExpando answer in that it gives you dictionary support, but by exposing this as a field it saves having to implement 15 or so members for IDictionary.

public class Flexpando : DynamicObject {
    public Dictionary<string, object> Dictionary
        = new Dictionary<string, object>(StringComparer.OrdinalIgnoreCase);

    public override bool TrySetMember(SetMemberBinder binder, object value) {
        Dictionary[binder.Name] = value;
        return true;
    }

    public override bool TryGetMember(GetMemberBinder binder, out object result) {
        return Dictionary.TryGetValue(binder.Name, out result);
    }
}

You may checkout Massive's implementation of a MassiveExpando which is case insensitive dynamic object.