[Gtk-sharp-list] Is there any way to check if the size of TreeViewColumn has changed?

[GeSe]

Hi, 
I am looking for a way to determine if the size of a TreeViewColumn has been
changed by the user. 
Is there some sort of event for this particular case? I have already looked
in the documentation but I haven't found anything. 
Maybe you guys can help me with this annoying problem.

Gerhard
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