InfoPath Dev

I have a form with 2 sections, containing hidden signatures of approvers. When manager1 approves, it should show signature1 - same for manager2 respectively. Of course either signature should only be visible when the whole form has been approved. How can I achieve this with formatting rules?

I would probably use a "status" field for this. You don't have to show it on the form. But then, when the form is submitted, you can have just the signature 1 section show. When the first manager signs, you can set the status field to "manager 1 signed" or something, and use that value to determine that the second section should show. After that manager signs, set status to Approved and use that to show the signatures read-only.