actionBindings vs command vs userdata

Is there a description or tutorial that shows what these are for and
how to use them?

I want to "fake" the user having clicked on a combo box by manually
triggering the event, but I don't know how.
I'm wondering if I can take advantage of actionBindings or command to
fake the event being triggered.

When I click on an item in the combo box, I want other combo boxes to
be updated. I know how to do this.

But with the initial setting of the main combo box, I will initialize
and manually select the string from my code.
When this happens, I would like the select event handler to be called,
so I want to simulate that event.


Does anyone know how this can be done?

thanks

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