During a flight from KLAS to KSFO, at top of decent, I went into the FMC approach page and selected the Flaps and speed but after doing this the only thing that showed up on FD was the speed (lower Left Corner), why would the Flaps selection not show up? BTW the plane never slowed down on approach either and was going 185 knts at the threshold so something was screwed up. Any ideas?