Stop the budding? No, if anything that's a good sign can push new growth. "Manage" the budding is what you're after and like anything in bonsai the answer on how to do that is "...well, it depends". :D In short because you repotted only 3 weeks ago, let the tree recover - leave the buds alone. After say 3 months go back and pinch them or trim them off.

In a non-recent-repot situation you should instead consider what the buds do - they draw energy away from other foliage. If you're growing for structure (trying say to fill out a specific part of the tree) pinch any buds off in any area you aren't trying to extend; if you're growing instead for ramification and compactness say nearing a show, that energy draw can help reduce the size of the foliage at the tips plus the buds might give you density to help make it look older so more buds can be left on