绑定（keyup）到jQuery中的动态元素（Twitter Bootstrap + typehead）

I guess some of you must have frowned eyebrows reading this title eh ? I'm sure people asks this everytime, yet, I haven't seen my particular question around so, I'm trying ! Binding events to dynamically created elements is my kryptonite, I just can't wrap my head around it ...I guess some of you must have frowned eyebrows