Adding symbols to FrameMaker 11 drop down symbol list

Many years ago, I posted the same question when I was using version 7, http://forums.adobe.com/thread/316088. Now I'm using FrameMaker 11 and need to do the same thing: add a new symbol to the standard list of symbols. I followed the instructions in the old thread step by step to the letter, yet the new symbol does not appear in the list.

Maybe I didn't use the correct file. The path I used for menus.cfg file is

C:\Program Files (x86)\Adobe\AdobeFrameMaker11\fminit\WorkSpaces\Unstructured\Menus

The path I used for cmds.cfg is

C:\Program Files (x86)\Adobe\AdobeFrameMaker11\fminit\configui

But there were others I could have chosen:

I'm using Unstructured FrameMaker.

I would greatly appreciate it if someone can help with how to add a new symbol to the list.