ok, that print button has a lot of code behind it that you don't see, it is a class, and to stop it for doing what it was intended to do you will have to put code on the Click event of your Print button, or better yet, you will have to open the class and see what triggers to print the report. I am pretty sure is the click() event. try first to put this in your print button
NODEFAULT
REPORT FORM nameOfReport TO PRINTER PROMPT NOCONSOLE