I managed to actually prevent the print window from appearing using  the xfa.event.cancelAction feature that Jono Moore mentions.  However,  it only seems to work consistently in versions 9 or better; anything  older and I had inconsistent results.  More details in this post:http://forums.adobe.com/...

I'm trying to do what the topic starter is doing as well (restrict printing until required fields are completed).  I've used something similar to what pguerett suggested in his first post.  I've called a function in the prePrint event of my main form as follows:form1.Mysubform::prePrint - (JavaScrip...