if you draw circles one inside another then you could fill the circle, but the default circle command is not very accurate and leaves gaps, you will need to use sin and cos or the line command to plot out a filled circle OR load a large circle bitmap as a sprite and use the scale/size or stretch sprite command to resize it and then paste it to the bitmap.
Mentor.
PC1: P4 hyperthreading 3ghz, 1gig mem, 2x160gig hd`s, Nvidia FX5900 gfx, 6 way surround sound, PC2: AMD 1.2ghz, 512mb ram, FX5200 ultra gfx, stereo 16 bit soundblaster, ups.