Set a focus to a button

I want t set a focus on a button. When I use the shown code in MFC for an edit control:

Code:

---

::SetFocus(
    ::GetDlgItem(
        GetSafeHwnd(), // HWND of the dialog window
        <id> ) );

---

everything goes OK. But when I try it for a button it failes.
However this code:

Code:

---

GetDlgItem( <id> )->SetFocus();

---

works well in both cases. What is the difference.

At last, what I must to do to set focus to a button in WINAPI, if my method is wrong?

Well...call 'GetLastError()' to retrieve the specific error code of 'SetFocus()'.