tooltips question

[Richard R]

Hello, I want to implement tooltips feature into my software however I have 
some questions about some code I found. Do I need to delete the window 
created by CreateWindowEx using DeleteWindow and also do I need to send a 
TTM_DELTOOL message when my program terminates? Also how would I turn this 
feature on and off? I already made a property of type boolean for this, I'm 
just not sure how to implement it. I'm still a newb with windows 
programming, but I do know what's going on here.

Here's the code

const
  TTS_BALLOON = $40;
  TTM_SETTITLE = (WM_USER + 32);

var
  count: longint;
  hTooltip: Cardinal;
  ti: TToolInfo;
  buffer : array[0..255] of char;

procedure CreateToolTips(hWnd: Cardinal);
procedure AddToolTip(hwnd: dword; lpti: PToolInfo; IconType: Integer; Text, 
Title: PChar);

Implementation

procedure CreateToolTips(hWnd: Cardinal);
begin
 hToolTip := CreateWindowEx(0, 'Tooltips_Class32', nil, TTS_ALWAYSTIP or 
TTS_BALLOON,
   Integer(CW_USEDEFAULT), Integer(CW_USEDEFAULT),Integer(CW_USEDEFAULT),
   Integer(CW_USEDEFAULT), hWnd, 0, hInstance, nil);
 if hToolTip <> 0 then
 begin
   SetWindowPos(hToolTip, HWND_TOPMOST, 0, 0, 0, 0, SWP_NOMOVE or
     SWP_NOSIZE or SWP_NOACTIVATE);
   ti.cbSize := SizeOf(TToolInfo);
   ti.uFlags := TTF_SUBCLASS;
   ti.hInst := hInstance;
 end;
end;

procedure AddToolTip(hwnd: dword; lpti: PToolInfo; IconType: Integer; Text, 
Title: PChar);
var
 Item: THandle;
 Rect: TRect;
begin
 Item := hWnd;
 if (Item <> 0) AND (GetClientRect(Item, Rect)) then
 begin
   lpti.hwnd := Item;
   lpti.Rect := Rect;
   lpti.lpszText := Text;
   SendMessage(hToolTip, TTM_ADDTOOL, 0, Integer(lpti));
   FillChar(buffer, sizeof(buffer), #0);
   lstrcpy(buffer, Title);
   if (IconType > 3) or (IconType < 0) then IconType := 0;
   SendMessage(hToolTip, TTM_SETTITLE, IconType, Integer(@buffer));
 end;
end;

procedure TForm.FormCreate(Sender: TObject)
begin
  CreateToolTips(Handle);
  AddToolTip(ListBox1.Handle, @ti, 1, 'Tooltip text', 'Title');
end; 
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