The control should print the rectangular area that fits all items, but won't skip pages from that area even if they contain nothing. E.g. if there are items only at the upper left and lower right of the diagram, some pages on the second diagonal might be empty. Is that the problem, or are you getting larger print area than necessary?

By pages #3 and #4 of total 6, do you mean the middle row of 2 columns x 3 rows of document pages? Could you email to support@mindfusion.eu a sample diagram showing that?

This means these pages are part of the content rectangle then, and they are printed even if they don't contain items. That's by design, the idea being you would print a big diagram and glue the pages or stick them on the wall. Since you have the source code, you can add some property to skip empty pages, or our developer can do that if you renew your maintenance - the choice is yours.