tabed_pane width

I'm using a layout vertical based in css, i would like that a tabed_pane adjust his width to the column width that contain it , reescaling
his width with the column, 
I'm trying in the css but i can't do it,
 some body can help me, thanks. 

I send a example with my problem.  
I,m think on make a nw_widget with this layout system, what think about?

-SaLvA-

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