[MFC] Enable/Disable all controls in propertypages

Hello everyone!!

I'd like to enable/disable all controls in some propertypages and I thought for this solution put in a common header included in all propertypages to avoid duplication code and without need to know necessarily which controls there are in each page:

BOOL CALLBACK DisableAllChildren(HWND hwnd,LPARAM) {
EnableWindow(hwnd,FALSE);
return TRUE;
}

void DisableControls(HWND hDlg) {
EnumChildWindows(hDlg,(WNDENUMPROC)DisableAllChildren,0);
}

where to disable, I could call as:

DisableControls( GetDlgItem(IDD_MODULES_PROPPAGE)->GetSafeHwnd() );

but I get this error:

error C3867: 'CCommonHeader::DisableAllChildren': function call missing argument list; use '& CCommonHeader::DisableAllChildren' to create a pointer to member

Reading an article on CodeProject I read also this technique isn't thread-safe if I have multiple threads doing the enumeration...

So how I can get to disable/enable all controls in pages safely?...

Thanks to everyone for the little help!!!
Ciao,
Luigi