is there a way to color text rows in pdf/writer ?

hey there all,

i am using ruby to make some pdf charts, but there is also a data
table i
need to put in there.
i am using pdf/writer and so far so good, but i can't find anywhere
that i
can change the color of the table text. I know that i can use
text_color to change the text color
of the whole table, but i need one row to be red, one blue etc...
Anyone help me out on this?