There are plenty of posts around asking about this same thing. You can look for them if you want the details but here's the general answer:
You can not and should not delete controls. If you need to delete controls because you're afraid of overflowing and creating too many, then you need to keep re-using old ones.
ZO_ObjectPool gives you a good way to dynamically create controls. I believe LootDrop uses it. It's worth studying.
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