You can individually specify different fonts and colors for the angle and the radius labels. The radius font is specified with PolarAxis::SetFont() and the angle font is specified with a call to PolarAxis::SetAngleFont()
You can adjust the color with the method PolarAxis::SetColor() ?>
The following example specifies different color for the labels. it also shows that you can add both a radial axis title as well as a tabbed title. In this example we have also chosen not to show the frame around the edge of the plot.