Tkinter events - how to make a "change" event?

[Thomas Lane]

At first it didn't work, but after a bit of experimenting, I found that
I needed to set "entryfield_modifiedcommand = myCallbackFunction"
instead of "entry_modifiedcommand = ...". The Pmw documentation was
wrong, but I got the thing working. Thanks for the help, Greg.

Greg McFarlane wrote:
> 
> It looks like you may be doing this:
>     combobox.bind('<blah>', blah)
> when you probably should be doing this:
>     combobox.component('entry').bind('<blah>', blah)
> The former puts the binding on the megawidget's hull component (the
> containing frame).
> 
> But you really should be using the modifiedcommand option of the
> combobox's entry component:
>     combobox = Pmw.ComboBox(...
>             entry_modifiedcommand = myCallbackFunction,
>             ...)
> 
> From the Pmw.EntryField manual page:
>     modifiedcommand
>         This is called whenever the contents of the entry has been
>         changed due to user action or by a call to setentry().
>