UI : Stack of box, problem with scaling/anchors

Hello
I Have a pile of UI Images in a GameObject to make my Left bar menu
It's ok.
http://prntscr.com/aq2j4g
BUT, when i try to rescale, it's totaly messed up.
http://prntscr.com/aq2j9u
http://prntscr.com/aq2jp9

Here is a screen of the setup of the boxes & the container
http://prntscr.com/aq2jyq
http://prntscr.com/aq2k2q
http://prntscr.com/aq2k6n

I Tried every combination on the anchors but nothing works as expected ( I want...

UI : Stack of box, problem with scaling/anchors