OK, I resolved the matter of hiding columns in the DetailDescription by simply adding the Browsable(false) attribute to the properties I don't wish to show. However, I still need to apply a CellContentTemplate to my DataGridItemProperty objects in my DetailDescription.  To clarify my question, I have the following DataGridControl defined ...

In my DataGridControl, I have defined Column objects for the columns of the master rows and DataGridItemProperty objects (like below) for the columns of the detail rows (PropertyDetailDescription in DataGridCollectionViewSource.DetailDescriptions). <xcdg:DataGridItemProperty Name=''MyProp'' DataType=''{x:Type sys:Decimal}'' ...