您的用户控件是一个单独的控件，您需要在它获得焦点时进行处理，然后集中处理要在该控件内关注的控件.

Your user control is a single control, you need to handle when it gets the focus and then focus on the control you want to focus on within that control.

解决，谢谢，您是正确的:)

Resolve, thank you, you were right :)