Alternative solution by Colin Nicholls:
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You should know that if REPORTBEHAVIOR 90, the preview window will ignore VFP8-style toolbar preferences.
However, you can hide the print button on the toolbar by manipulating it directly. See my article Exploring and Extending Report Previewing in VFP9, particularly the section half-way down where it talks about the presetting the preview and the .AllowPrintFromPreview property.