/*  in header */

...........

#define WM_PINGICONMESSAGE WM_USER + 1

...........
        void __fastcall PingIconMessage(TMessage& Msg);
public:        // User declarations
        __fastcall TConfig(TComponent* Owner);

        void __fastcall LoadConfiguration();

        BEGIN_MESSAGE_MAP
           VCL_MESSAGE_HANDLER(WM_PINGICONMESSAGE, TMessage, PingIconMessage)
        END_MESSAGE_MAP(TForm)
............

/*  in source */

void __fastcall TConfig::PingIconMessage(TMessage& Msg)
{
   if (Msg.LParam == WM_RBUTTONDOWN)
   {
      POINT p;
      GetCursorPos(&p);
      SetForegroundWindow(Handle);
      PopupMenu->Popup(p.x, p.y);
   }
   if (Msg.LParam == WM_LBUTTONDOWN)
   {
      ...........
   }
}

잘 보시고 해보세요.