Is this supported?

I've tried without any luck.. the editor is populated with data as it should (using ObservableCollection<dynamic> as ItemsSource), but the correct DataTemplate for the relevant data type is not shown, just the default included in the control:

<UserControl.Resources>
        <DataTemplate DataType="ctl:ProductType1">
            <StackPanel Orientation="Horizontal">
                <TextBlock Text="{Binding Path=PartNumber}"/>
                <TextBlock Text=" - "/>
                <TextBlock Text="{Binding Path=RevisionName}"/>
            </StackPanel>
        </DataTemplate>
        <DataTemplate DataType="ctl:ProductType2">
            <StackPanel Orientation="Vertical">
                <TextBlock Text="{Binding Path=PartNumber}" FontWeight="Bold"/>
                <TextBlock Text="{Binding Path=Name}"/>
            </StackPanel>
        </DataTemplate>
    </UserControl.Resources>

<ig:XamComboEditor 
TabIndex="1" 
x:Name="EditorNewPartNumber" 
Grid.Column="1" 
Grid.Row="4" 
Margin="0 5 0 0" 
FontFamily="Segoe UI" 
FontSize="13" 
ItemsSource="{Binding Source={StaticResource ViewModelLocator}, Path=ViewModel.Products}" 
DisplayMemberPath="PartNumber" 
SelectedItem="{Binding Source={StaticResource ViewModelLocator}, Path=ViewModel.ProductItem, Mode=TwoWay}" 
CustomValueEnteredAction="{Binding Source={StaticResource ViewModelLocator}, Path=ViewModel.ProductEnteredAction}" 
AutoComplete="{Binding Source={StaticResource ViewModelLocator}, Path=ViewModel.IsProductEnabled}" 
Visibility="{Binding Source={StaticResource ViewModelLocator}, Path=ViewModel.IsProductRequired, Converter={StaticResource BoolToVisibilityConverter}}" 
KeyUp="EditorNewPartNumber_KeyUp">
</ig:XamComboEditor>