Thanks, this info is also useful for me, but this is not exactly that I was asking for.
I mean, that I can't find the way to change the Initial Layer of an object such as ProgressBar via an Event Sheet.
For example for a sprite object, we could do it via Action: OurSprite : Move to layer ; new layer
But for ProgressBar there is no such an option like for Sprite.
If for example i want to hide a progressBar by moving it for a specific layer together with the sprite it is attached to, what should I do in that case?