I was able to convince my Phillips PM3320A (ca. 1987) to do it, but it wouldn't the horizontal of the FFT result as frequency, only as points. I guess the firmware designers didn't anticipate users doing FFT of a d/dr of a waveform. Anyway the resulting FFT just wasn't as convincing as the WavePro result. I manually measured the -3dB bandwidth as 375 MHz, not bad for a 200 MHz scope.
Is your WavePro actually as grey as it looks in the photo? My 960 is a distinctive blue-grey that is actually quite ugly.