I don't know if you need this anymore but since I just figured this out I thought I would share. I couldn't get the tcl file to work so I jumped to python.
Bellow is apart of my script. you should note that you need to locate your .nuke folder. I'm on a mac so I will give you a script to show the hidden files.
Place this in your terminal
defaults write com.apple.Finder AppleShowAllFiles Yes
it should appear under the home or house icon....
note that the icon must be placed in the in the following directory,
Applications/Nuke5.2v1/Nuke5.2v1.app/Contents/MacOS/plugins/icons
Menu.py
toolbar = nuke.toolbar("Nodes").addMenu("name of menu", icon="iconName.png")
The next line is just for a sub menu...
toolbar.addMenu("name of sub menu" , icon="iconNae.png")
I hope this helps
Dave
