Can I show total in graph?

I have a graph, shows product-sales.

x - axis product-codes
y-axis - sales

I want to have on more field "all products" which shows overall sales.

Can I do it?

This can be done through across-total

Though I could get the ACROSS-TOTAL, I am not able to get the label for Across-total

This is the sample code
GRAPH FILE TEMP
SUM
sales
ACROSS prod_code as 'Products'
Across-Total as "All Products"
END

How can I show the LABEL "All Products"?