[General] Progress bar the other way around

[RaMs]

Hello. I'm using this Progress bar to do my system of casting abilities.

But now i want to make abilities that are channeled, in such way that the bar starts full and empties (the other way around that the model does it), just like it does in Wow. But i think that the model dosn't have this option.

Here an example of what i'm trying to do (second 15). That "Channeling" bar.