[Gtk-sharp-list] How to set a "null" value in a spinbutton

[lordphoenix]

Hi,

I would like users of my application can drop content of a spinbutton to
set a null value but each time the value is set to "0" when lost focus. 
I can do it in code but in this particular case it's not really a very
good solution.

Anyone has an idea?


PS : Sorry for my bad English I don't speak it very often :)
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