The reason that F10 does nothing is because there is already a binding on all for <F10>. In Motif apps, F10 moves focus to the menu bar, like pressing and releasing Alt does on Windows. When there is a binding for a key, the handling of the event "event add" never takes place.
If you want to get rid of this binding, you would do it with something like w.bind_all("<F10>", "") for some widget w. I don't know why you see the "L1" and "L2" keysyms. I don't on my system (Fedora Core 2) Jeff
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