Well Vannie, you could cut off that top bud, try a little diluted fertilizer, or leave it be.
'Lucky Bamboo' is a stylized look. It actually is dracaena stalk that has all the leaves stripped off and a new top allowed to start. And if you have ever seen a dracaena with its leaves still on you will know that it is not a branching type plant, so that one leafy spring is probably all you are going to get from your lucky bamboo. Sorry =/