Printing smartform.

Hi all,

I am working on smartforms with VA02 transaction.

my requirement is like this.

when user makes any changes to sales order and clicks on save button have to print my form automatically and same have to happen when clicks on print button.(For print button i have to do nace settings and call my form but what about save button)

can any one help me inthis .

THanks and regards,

gopal