Added editable cells, but they don't change value

[Dave Bartmess <dingodave edingo net>]

I looked at the docs at 
http://www.gtkmm.org/docs/gtkmm-2.4/docs/tutorial/html/ch08s08.html, but I 
still don't understand this.

I have three columns, each added using m_TreeView.append_column_editable(), 
and when I go into the app, I can edit the value of each cell, but when I hit 
enter, it goes back to the original value. How do I notify the app to load 
the new value and keep it in the refListStore for future use?

Thanks!
-- 
Dave Bartmess
http://edingo.net
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