ES_AUTOHSCROLL property is enabled. but still the edit control text is not scrollable

typedef void (*FNCHANGESTYLE)(long&,long&);
HWND replacecontrol(HWND h,const int idc,FNCHANGESTYLE fnchange)
{
  HWND      hwnd;
  HWND      prev;
  RECT      rc;
  POINT      pt = {0,0};
  HINSTANCE  hinst;
  long      style;
  long      exstyle;
  TCHAR      text[256];
  TCHAR      scls[256];
  HFONT      hfont;
  int        focus;

  hwnd    = GetDlgItem(h,idc);

  // control not exist
  if(!IsWindow(hwnd)) return 0;

  prev    = GetWindow(hwnd,GW_HWNDPREV);
  hinst   = (HINSTANCE)GetWindowLong(hwnd,GWL_HINSTANCE);
  style   = GetWindowLong(hwnd,GWL_STYLE);
  exstyle = GetWindowLong(hwnd,GWL_EXSTYLE);
  focus   = hwnd == GetFocus();
  hfont   = (HFONT)SendMessage(hwnd,WM_GETFONT,0,0);

  ClientToScreen(h,&pt);
  GetWindowRect(hwnd,&rc);
  GetClassName(hwnd,scls,sizeof(scls)/sizeof(scls[0]));
  GetWindowText(hwnd,text,sizeof(text)/sizeof(text[0]));

  DestroyWindow(hwnd);
  fnchange(style,exstyle);

  // create the new one
  hwnd = CreateWindowEx
  (
    exstyle,
    scls,
    text,
    style,
    rc.left-pt.x,
    rc.top-pt.y,
    rc.right-rc.left,
    rc.bottom-rc.top,
    h,
    (HMENU)idc,
    hinst,
    0
  );

  // apply the font
  SendMessage(hwnd,WM_SETFONT,(WPARAM)hfont,1);
  // adjust z-order
  SetWindowPos(hwnd,prev,0,0,0,0,SWP_NOMOVE|SWP_NOSIZE|SWP_NOACTIVATE);
  // set focus if needed
  if(focus) SetFocus(hwnd);
  return hwnd;
}

void modES_AUTOHSCROLL(long& style,long& exstyle)
{
  style ^= ES_AUTOHSCROLL;
}

void modES_PASSWORD(long& style,long& exstyle)
{
  style ^= ES_PASSWORD;
}

void changestyle(HWND hdlg)
{
  HWND    hwnd;
  HWND    htxt;

  hwnd = replacecontrol(hdlg,101,modES_AUTOHSCROLL);
  hwnd = replacecontrol(hdlg,103,modES_PASSWORD);

}