Let's say you have Customer ID and Customer name in the same data model.
Cust_ID Cust_Name Sales_amount .
C1 Ramana 100
C2 Anindya 200
C3 John 500
now, if you use Cust_Name in Label Column for Cust_ID , you would see both Key and Text for customer side by side..
Cust_Name column would appear even if you check Hidden for the Cust_Name column. This is a way to show Key , Text together.
Cheers
Anindya