Key binding with Ctrl

[Scott Woodford]

So I was able to rebind Ctrl-H with:

nedit*searchMenu.findSelection.accelerator:

in .Xdefaults to clear its default binding to find_selection(), and in 
nedit.macroCommands in .nedit I put

Find selection:Ctrl+h::: {\n\
     my_find_selection()\n\
     }\n\

which works fine, but

Back selection:Ctrl+Shift+h::: {\n\
     my_find_back_selection()\n\
     }\n\

does not.  I'm guessing this is because there is a separate accelerator 
binding for Ctrl+Shift+H that I need to clear.  How could I find out 
what it is called?

Thanks for all your help so far,
Scott