How to add a toolbar to a UIPickerView subclass?

I've created a UIPickerView subclass, I've completed the implementation of the picker view itself.

What I would like to do however is to add a toolbar above the p开发者_Go百科icker view as part of the new class. How and where should I do this in the subclass implementation?

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I would add both the picker and the toolbar to another view and use that as your "control"