Hey Simon,
This KB describes how to do it:
I did a search for print and componentworks
http://ae.natinst.com/operations/ae/public.nsf/fca7838c4500dc10862567a100753500/dc3430165bc916c586256317006f8cc9?OpenDocument
(ComponentWorks was the name for our ActiveX control in VB. This KB talks about printing a graph, but the CWIMAQViewer has the same method to get the ControlImage
Hope this helps,
Brad Buchanan
IMAQ Product Support Engineer