BCGControlBar Pro for MFC
void CBCGPEdit::EnableShellAutoComplete ( BOOL  bDirsOnly,
LPCTSTR  lpszCurrentDirectory = NULL,
LPCTSTR  lpszFileFilter = NULL 
)

Enables or disables the shell auto-complete drop-down list for this edit box.

Parameters
bDirsOnlySpecifies whether the list displays the directories only and includes the files.
lpszCurrentDirectoryThe optional pointer to the current directory.
lpszFileFilterThe optional file filter (in the same format as the file dialog, e.g., _T("*.cpp;*.h").