Rob Shearman wrote:
This seems really wrong. You are destroying and creating the updown control on every size event?!?! That's really going to slow resizes down. Is there any evidence that the native version does it like this?
No, I don't have evidence of that. On the other hand, it is unlikely the control will ever be resized, except once after creation. Looking through the messages that the updown control responds to, there are none that allow resizing that I can see. And while I have not verified this with Microsoft docs, it supposedly implements all documented functions (according to the header).