[Glade-users] insert_text question

Hello everybody,
My comboBoxEntry field accepts manual input, but I would like to limit the input to alpha numeric characters 
only. For the regular gtkEntry fields, I would use insert_text handler, but comboBoxEntry doesn't have 
insert_text. Any idea how would I go about limiting the input to alphanumeric chars for cmbBoxEntry field?
Thanks much,
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