I had previously downloaded Caspian; now I am reading Modena although I'm not an CSS expert.
Anyway, I would expect that setting ColorDrawable.Color property would suffice to obtain the right color and unfortunately that seems not the case.
Have a look at my final attachment. It shows TextFields set to #BEBFBF , Combobox to #F1F2F2 (both by Internal designer) and ADP to #BEBFBF through its Style property (-fx-base: #BEBFBF) and they all differ from your screenshot from post #4 above.
As already said, it's not a big problem since I found a way to circumvent it, but I feel it could eventually help others if they will ever run in a similar situation (and if they use the SEARCH function..ehehe).
udg