Originally Posted by Milton
Ah, I understand. Reusing it means just changing the functionality of it, what is displayed and what it does, without creating a new frame.
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Exactly. Blizzard also added CreateObjectPool/CreateFramePool in BfA I think if you don't want to write the code to handle the frames yourself. You just create a pool and acquire a unused/new button and release it when you don't need it anymore so it can be reused later when you need another one.