Change the color of box in Title Clip

First of all, this is my first attempt in video editing & kdenlive is the first software I am using.

How do I change of the box in Title Clip mentioned here?

http://www.youtube.com/watch?v=CisdeIixwlw&feature=player_detailpage#t=20s

I tried to changing "Fill Color" and "Border Color" values but nothing changes. The color of text can be changed but I can't change the color of the box.