replace default tool-bar by home-grown tool-bar

[matthias]

Hi there,

i am meditating over chapter 22.17 from the Emacs Lisp-manual for a 
while and couldn't really get a hint on how to have my own tool-bar. I 
understand how to define a keymap that describes the tool-bar but how do 
i tell emacs to use my keymap? Maybe it is too obvious, but i can't 
figure it out...
I didn't find any hooks for the tool-bar. While they are used so 
frequently i wonder why there is none in this case. Wouldn't it be a 
good idea to have one that defines all the buttons in the tool-bar?
If you can point me to a very simple example that would be nice.

thanks in advance
matthias