We use DataTemplates a lot so that we can programmatically generate lists of items to be displayed in a ItemsControl.

The UI designers use Blend to create the XAML for how the item looks and we then create a DataTemplate using that XAML.
The problem is that once the DataTemplate is created the XAML is no longer editable in Blend.

Is there a workflow that allows us to use DataTemplates but still keep the XAML editable?

In Blend you can create, apply or edit additional templates for some controls using the context menu:

- ContentControl.ContentTemplate: .
- ItemsControl.ItemTemplate and ItemsPanel: .
Is this what you are looking for?