SHFileOperation probleme

Hello.

I've got 2 problemes with SHFileOperation function.
So, this's my code :

/*****************/
sh.hwnd = (HWND) AfxGetMainWnd ();
sh.wFunc = FO_COPY;
sh.pFrom = pSource;
sh.pTo = pDest;
sh.fFlags = FOF_SIMPLEPROGRESS|FOF_MULTIDESTFILES;

sh.fAnyOperationsAborted= TRUE;
sh.hNameMappings = NULL;
sh.lpszProgressTitle = "Enregistrement en cours ...";

SHFileOperation (&sh);
/*****************/

The 1st probleme's if the destination file exist, it'll not be copied.
The 2nd probleme's that SHFileOperation must show a dialog progress
and it doesn't do that? Why ?

Thank.