How to use patch/fill on a polarplot

Hi all

I can't seem to get this right, so I figure I better ask someone with more experience:

How do I use patch/fill to fill in a polygon in a polarplot setting?

Based on the example listed in the help for polarplot: How do I fill in this triangle with e.g. the color red?

t = 0 :pi/1.5: 2*pi;
pp=polarplot(t, sin(2*t).*cos(2*t), '--r');