Gnome 3 style tabs in vala

[Satyajit Sahoo <satyajit happy gmail com>]

Hi, I'm trying to implement a GUI in vala with tabs like in new Gnome 3
apps. I'm mostly successful, but have a few hiccups. I think perhas this
may not be the nicest implementation.

And, when you click a active tab, then the togglebutton state changes,
which is kinda confusing. I cannot think of a way to workaround it.

I'm very much new to vala, so please be kind to me :D

The code of the app is here
https://github.com/satya164/elegance-colors/blob/master/elegance-colors-gui.vala

-- 
Satyajit Sahoo
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