RoboWizard's Tips & Tricks are indeed cool and tricky (and tippy!). But the Related Topics Tweak for Single Items might be outdated. Firstly, I think when he talks about the TrueCode tab, he means the HTML tab (at least in my scenario). But he talks about a "gray" area of the code that can only be modified if you replace a CLASSID preceding the Related Topics button code. He adds a note that this stopped working in 2002. The topic seems to have been written ages and ages ago, so I don't know if RoboWizard's answer is relevant anymore.
Indeed that topic was created long ago. However, the tweak should still be valid if you read between the lines and adapt for the modern code. The underlying technology behind the tweak hasn't changed to my knowledge, so it should still work.
At the time when I made the Tips & Tricks available and maintained it regularly I was working in the corporate world, had an ample supply of funding (and health benefits! w00t!) but given the economic climate I simply cannot maintain updating it when I have other things that may help me stay in a house (assuming I'm lucky enough for folks to actually want to buy my stuff) so I hope you will forgive the lack of maintenance and updates.
Helpful and Handy Links
Jeepers - long ago but not forgotten! Couldn't even remember what this was about.
However, my update is that I have moved on to RH 8, and simply avoid having only one related topic.