Combobox Activation Problem

I am writing a GTKGLExt application and based on various widget settings I 
redraw the OpenGL scene.  One of my widgets is a combobox from which the user 
can select one of several items.  When they select an item I want to redraw 
the scene based on the new setting.  I have tried using the "activate" signal 
to execute the desired callback function but it is only called when the Enter 
key is pressed not when the mouse is clicked.  I tried using the "changed" 
signal  but the callback is called twice or more times if the combo is 
clicked and dragged through the items.

Is it possible to get the desired action I am looking for.  If not, it doesn't 
seem that the combobox has much use for "real-time" interactions.

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