[gtkada] On button clicked callback

[Osmanys Fuentes Lombá]

Hello, I'm looking for help: i have a button wich callback is connected 
to a tree model displayed on a tree view, when the button is clicked a 
dialog with an entry appears, after entering the text data is done and 
the return key is pressed the button must update the model, the problem 
is that the action happens but the second time that the button is 
clicked, that means: the second call to the callback update the model 
with the first data, the third call use the second data and so on...

Somebody knows hom to solve this problem?

Best regards.

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Lic. C. Físicas Osmanys Fuentes Lombá

Dpto. Termoconversión

Centro de Investigación de Energía Solar

Santiago de Cuba