Actually one way or the other is controversial. Some say the spokes hang the wheel because when you set on the bike the bottom spokes detension slightly thus the spokes above the hub stay the same, they don't detension but stay as the preset tension was at time of build. Some say the spokes above tension up a bit more, I can't see that happening. So the wheel actually hangs from the top regardless if the tension increases or not, while the bottom spokes detension regardless of the top spokes increase tension or not.
I saw a ultra slow motion film once showing spoked wheels under load deflecting slightly on the bottom but not on the top. The same was true with hard torque being applied.
I'm not trying to flame anyone because there is both school of thoughts, and personally I don't think anyone is truly wrong, but more of an opinion, and mine is that they hang. But having said that here's a site that claims they stand:
Ian's Bicycle Wheel Analysis But Harvard says they hang; see this:
Hubs hang from the rim!
One thing for sure they don't do both equally. So I guess you'll have to decide and come to your own opinion. Fortunately your life doesn't depend on your opinion being one way or the other!!!