You place your button on 100,640 point. Please ensure that your user control can accomodate your dynamic button. Otherwise, you won't see it.
I used your code and it worked fine for me, just ensure the proper size of both parent form and user control.
Most likely it is just that your button is being placed out of the bounds of the parent control and/or behind another control. I don't believe that UserControls or Forms are special in respect to adding controls at run-time, but a simple difference may be that Forms are by default re-sizable whereas UserControls aren't? Either way I don't think either Control type will automatically resize to fit all their child controls, so it's quite easy to put a new/dynamic control in the wrong place and have it not be visible.
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