Rendering materials

I am trying to render a couple of parametric and compound cells (curtain wall and rolling shutter).

1. I assigned the material and color in the PCS for the parametric cell. But it shows up in the material color and i am unable to change it to any other. How can I change it? I tried to change by level, by level override and also by render attach material. But i am still not able to render to the colors i need.

2. Which would be the preferred method for assigning materials and colors or is it only choices???

3. I had the similar issue with the default rolling shutter. I am getting it in a bright red color which i am not able to change though i tried it in a similar way as mentioned. In PCS, i see it as 'galvanized' (grey) but in the dgn and renders, it remains as red. Any suggestions?

 Thanks.