Disabling context menu in CHM file

Hi! I'm brand new to the forums and I'll be generous and say "mildly" proficient with RoboHelp 7. (In apparent ignorance, I would have classified myself as moderate until I checked out some of the questions around here! Holy cow!)

Here's my problem:

I've been requested to remove the print functionality from the context menu in a CHM file. We use only CHM files -- no WebHelp files. This particular CHM is going to be available in a terminal server environment, so there is no possibility for a workaround by means of manipulating registries - one solution I came across while searching for answers.

We have already removed the Print button, but discovered that good old CTRL + P still works.

I haven't found anything in Project Set Up or Project Manager that addresses this issue. Can anyone help?

I am using RoboHelp 7, but I see that RoboHelp 8 is available. Would upgrading to that version solve this problem?

Thanks for any assistance!