How do I change the column header of a GridView into 2 rows?

Question

Hi,

 

 

Can someone advise me how to make the column header into 2 rows or anyway so long a long word can split into 2 layers ?

 

Please find attached SupplierList where I want to me Supplier Code in 2 rows cos SupplierID and SupplierCode are jamming together.

 

Thanks.