You can construct your objects via XML. There is no documentation but it is not so hard to construct...see the contents of XMLs, try to change parameters and look at the changes.
HI, tnx !
infact, I've tried to modify (via xml) the temperature gauge to read Umidity but the temperatur gauge display inverse value : 70% of UR is displayed in the bottom part of gauge,like it was 20% of full scale.