why CMFCToolBarButton::HasFocus（） allways return No?

[凤凰与梧桐]

afxtoolbarbutton.h

HasFocus（）like this

virtual BOOL HasFocus() const
{
HWND hwndBtn = ((CMFCToolBarButton*)this)->GetHwnd();
return hwndBtn != NULL && (hwndBtn == ::GetFocus() || ::IsChild(hwndBtn, ::GetFocus()));
}

GetHwnd() like this

virtual HWND GetHwnd() { return NULL; }

GetHwnd() return NULL, allways

so

hwndBtn =NULL，allways。

design fault ？

Continue reading...