Is it possible to bind the ItemsSource of the ComboBoxItemsProvider to an ObjectDataProvider?  I was under the impression that with normal ComboBoxes and other ItemsControls this was possible.  Is there something different about the ComboBoxItemsProvider that doesn't allow this?  I get this error when I try:

Cannot convert the value in attribute 'ItemsSource' to object of type 'System.Collections.IEnumerable'. 'System.Windows.Data.ObjectDataProvider' is not a valid value for property 'ItemsSource'.

This works fine with a normal ComboBox.

Here's a snippet of my XAML:

<UserControl.Resources>
...
        <ObjectDataProvider ObjectType="{x:Type bll:LocationManager}"
                            x:Key="locationProvider"
                            MethodName="GetLocations">
            <ObjectDataProvider.MethodParameters>
                <s:Int32>1</s:Int32>
            </ObjectDataProvider.MethodParameters>
        </ObjectDataProvider>
        <igEditors:ComboBoxItemsProvider x:Key="locationItemsProvider"
                                        ItemsSource="{StaticResource locationProvider}"
                                        ValuePath="LocationID"
                                        DisplayMemberPath="LocationDesc"
                                        >
       </igEditors:ComboBoxItemsProvider>
</UserControl.Resources>

GetLocations returns a List.

And of course further down in the XAML my XamComboBox binds to the ItemsProvider.  Any help would be appreciated!

Thanks!