Bind DisplayMemberPath to the ItemTemplate of the ListBox dynamically in WPF?

Question

I'm creating a custom control that has an ItemsSource and DisplayMemberPath properties, and in the ControlTemplate there's a ListBox control that's bound to this ItemsSourse , I want to use the property specified by DisplayMemberPath in this ListBox, unfortunately this doesn't work:

<ListBox ItemsSource="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=ItemsSource}">
                                <ListBox.ItemTemplate>
                                    <DataTemplate>
                                        <TextBlock Text="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=DisplayMemberPath}"/>
                                    </DataTemplate>
                                </ListBox.ItemTemplate>
                            </ListBox>

EDIT

As Mike Strobel suggested in the comment and as I read in some blog posts, I removed the ItemTemplate and provided only the DisplayMemberPath in the ListBox but this doesn't even bint to the list (there's no scroll bar):

    <ListBox ItemsSource="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=ItemsSource}" 
DisplayMemberPath="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=DisplayMemberPath}"/>

I even hard-coded the DisplayMemberPath value and still not working!, it's only working with List<string> not List<CustomClass>

Solution

Pardon, I missed changing the DP type from IEnumerable<string> to IEnumerable<object> Thanks for the help!

Answer 1

Could it be that the TemplatedParent object isn't what you think it is? Have you tried traversing back by specified type?

<ListBox ItemsSource="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=ItemsSource}">
    <ListBox.ItemTemplate>
        <DataTemplate>
            <TextBlock Text="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type **TYPE**}}, Path=DisplayMemberPath}"/>
        </DataTemplate>
    </ListBox.ItemTemplate>
</ListBox>