Problem with setOpaque in ULC 6.1

I'm trying to set the opaque property of a ULC component to false (to
disable the painting of its background) but it seems the
UIComponent.setOpaque() wont never be called.

Is that a bug? I had to override the ULCComponent.setOpaque() and
sending by myself the "opaque" state change to the client side instead
of using current implementation.

Is it right?

Best regards,
Paolo Scaffardi
GFP Lab s.r.l.
http://www.gfplab.com
fax 178 2258454