Focus issues with homemade controls

aacc11

When the self-made control gets the focus, the virtual frame (such as the built-in connamd of vb) should draw by itself? How to draw? Use API?

snowmanzf

Draw with this API:
Declare Function DrawFocusRect Lib "user32" Alias ​​"DrawFocusRect" (ByVal hdc As Long, lpRect As RECT) As Long