how to disable mouse right click options in single edit box ex.paste,copy,cut then i used this conditions all edit box accessed. please answer frnds....in VC++ 6.0 MFC

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BOOL CLoginDialog::PreTranslateMessage(MSG* pMsg) { if(pMsg->message == WM_RBUTTONDOWN) { if(pMsg->message==WM_COPY) GetDlgItem(IDC_EDIT_UNAME)->SetWindowText("") ;//IDC_EDIT_UNAME id of username return true; } return CDialog::PreTranslateMessage(pMsg); }