From: Alex DeCaria <alex.decaria@...>
Date: 2007-03-16T22:13:22+09:00
Subject: Binding or executing a command with a TkOptionMenubutton

I want my program to execute a command whenever a new selection is made
from a TkOptionMenubutton.  The -command option isn't allowed with
TkOptionMenubuttons, so I've been experimenting with various bindings,
but can't find an appropriate binding event.

I've tried the following simple example which should print the value of
the selection, but it only works if the mouse is directly over the
button itself, and not over the expanded options.

Any ideas how to do this?

#------------------------------------
require 'tk'
root = TkRoot.new.title("MenuOptionbutton")

list = ["1", "2", "3", "4", "5"]
var = TkVariable.new
button = TkOptionMenubutton.new(root,var,*list).pack
button.bind('ButtonRelease-1') do
  print var, "\n"
end

Tk.mainloop

#--------------------------------------------

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