Using datatemplate to bind object with multiple properties of same type to gridview

Question

Using WPF, assuming I have 2 classes:

public class SimpleType {
    public string Name { get; set; }
}

public class ComplexType {
    public SimpleType Item1 { get; set; }
    public SimpleType Item2 { get; set; }
}

and I want to bind a collection of these objects to a gridview, and in other places as well. I always want SimpleType to be shown a particular way, so I made a datatemplate for it in the XAML (there are more properties but I'm trying to simplify the example as much as possible):

<DataTemplate x:Key="SimpleTypeTemplate" DataType="{x:Type local:SimpleType}">
    <StackPanel Orientation="Horizontal">
        <Label Content="{Binding Path=Name}" />
    </StackPanel>
</DataTemplate>

How do I bind this to a gridview?

<GridView>
    <GridViewColumn CellTemplate="{StaticResource ResourceKey=SimpleTypeTemplate}" />
    <GridViewColumn CellTemplate="{StaticResource ResourceKey=SimpleTypeTemplate}" />
</GridView>

How do I indicate that I want to use the Item1 property for the first cell and Item2 for the second? Using DisplayMemberBinding let me specify the property, but I couldn't reuse the template. If I specify the CellTemplate, I can't seem to figure out how to specify the property. Am I missing something obvious, or am I just going about this the wrong way entirely? Thanks for any help.

edit: Not sure if it matters, but I think I should specify the gridview is within a listview where I specify the ItemsSource property for binding to an IObservableCollection in the underlying class.