What is forcing UIScrollBar Background to disable when value is 0

[r.pedra]

Hi,
We have a problem in our project.
Some scrollbars are related to each other and does stuff when the others do stuff.
The problem is that when a Scrollbar have a value of 0, something is going wrong, and built in anchors are not refreshing correctly.

On the screenshot, the object container is the background of the UIScrollbar on Aff. You can see that the UISprite on Container have his anchors left property linked to an object named Sprite. This is the Sprite object below Eco.
But for some reason when the UIScrollbar start and that its value is setted to 0 in the code, even if we call ForceUpdate, UISprite is disabled(seems to be related to the 0 value) and the anchor doesn't refresh.
(I updated to the last version of NGUI but it didn't solved my problem).
So where does NGUI disable Widgets when Scrollbar value is 0 ?

[ArenMook]

Scroll bar disables its foreground when the value is 0. UIProgressBar.cs, line 446. You can change it to be mFG.alpha = 0f instead if you like. You will need to adjust other mentions of "mFG.enabled" as well though.

[r.pedra]

Working like a charm, thank you