What is The Way To Post And Print Packing Slip from Purch Line

Hey Here My requirement is we are taking The Data from Purch line and in that when The open order details as received by posting packing slip after posting the packing slip i need get Print of the packing slip so please help for this customization in this i can’t use the menuitem button just in with one button click it need to work

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Advancely Thanks For All