Print a credit memo

This may be something simple I'm missing, but I cannot print a Credit Memo in the AR module. I can credit it, and it will show up on the customer statement, but i can't get it to print a copy of the credit memo itself. Is it a simple step I'm missing?
I process it by clicking the invoice, changing payment to Credit Memo, putting the details and saving.
I've also tried it by processing the CM as new and then linking the transactions.
Can anyone advise?