smartone - What you are doing is possible I believe. I personally like to see the colors change for each signal so I never thought about doing what you are asking. I wrote the following paint bar
"if CCI(14).Main>0 and EMA(3)>EMA(8) set color to green" just to see if it would work. It worked fine for me. I put the paint bar in a CCI plot that was NOT the CCI(14) plot, so I think you can put the paint bar anywhere you want it. However one caution, you can not write a paint bar formula for any signal, like EMA(3), unless the signal is plotted.
Good luck,
Jon