[This is preliminary documentation and subject to change.]
The OnTVFocus method advises that WebTV for Windows has gotten focus.
HRESULT OnTVFocus(void);
 None.
WebTV for Windows ignores the value returned by this method.
WebTV for Windows calls this method when it gets focus. Your control can use this method to force focus to a specific window.
  Windows NT: Unsupported.
  Windows: Requires Windows 98.
  Windows CE: Unsupported.
  Header: Declared in tvdisp.odl.
  Import Library: User-defined.
  Unicode: Yes.