function EnumChildProc(Wnd: hWnd; SL: TStrings): BOOL; stdcall;
var 
  szFull: array[0..MAX_PATH] of Char; //Buffer for window caption 
begin 
  Result := Wnd <> 0; 
  if Result then  
  begin 
    GetWindowText(Wnd, szFull, SizeOf(szFull)); // put window text in buffer 
    if (Pos(SL[0], StrPas(szFull)) > 0) // Test for text 
      and (SL.IndexOfObject(TObject(Wnd)) < 0) // Test for duplicate handles 
      then SL.AddObject(StrPas(szFull), TObject(Wnd)); // Add item to list 
    EnumChildWindows(Wnd, @EnumChildProc, Longint(SL)); //Recurse into child windows 
  end; 
end; 

function ClickButton(ParentWindow: Hwnd; ButtonCaption: string): Boolean; 
var 
  SL: TStringList; 
  H:  hWnd; 
begin 
  SL := TStringList.Create; 
  try 
    SL.AddObject(ButtonCaption, nil); // First item in list is text to find 
    EnumChildWindows(ParentWindow, @EnumChildProc, Longint(SL)); 
    H := 0; 
    case SL.Count of 
      1: ShowMessage('Window text not found.'); 
      2: H := hWnd(SL.Objects[1]); 
      else  
        ShowMessage('Ambiguous text detected.'); 
    end; 
  finally
    SL.Free;
  end;
  Result := H <> 0;
  if Result then PostMessage(H, BM_CLICK, 0, 0);
end;

// Rememeber the ampresand for underlined characters
// if the 'c' is underlined, then the text is '&click'