Code:

TForm.Style:=bsNone

Code:

setWindowLong (handle,GWL_STYLE,getWindowLong(handle, GWL_STYLE) and not WS_CAPTION);

width:=width+1;

width:=width-1;

Code:

{ Private Declaration }

procedure CreateParams(var Params : TCreateParams); override;

...

procedure TForm1.CreateParams(var Params : TCreateParams);

begin

inherited Createparams(Params);

with Params do

Style := (Style or WS_POPUP) and not WS_DLGFRAME;

end;

Code:

procedure TForm1.HideTitlebar;

var

Style: Longint;

begin

if BorderStyle = bsNone then Exit;

Style := GetWindowLong(Handle, GWL_STYLE);

if (Style and WS_CAPTION) = WS_CAPTION then

begin

   case BorderStyle of

     bsSingle,

     bsSizeable: SetWindowLong(Handle, GWL_STYLE, Style and

         (not (WS_CAPTION)) or WS_BORDER);

     bsDialog: SetWindowLong(Handle, GWL_STYLE, Style and

         (not (WS_CAPTION)) or DS_MODALFRAME or WS_DLGFRAME);

   end;

   Height := Height - GetSystemMetrics(SM_CYCAPTION);

   Refresh;

end;

end;

procedure TForm1.ShowTitlebar;

var

Style: Longint;

begin

if BorderStyle = bsNone then Exit;

Style := GetWindowLong(Handle, GWL_STYLE);

if (Style and WS_CAPTION) <> WS_CAPTION then

begin

   case BorderStyle of

     bsSingle,

     bsSizeable: SetWindowLong(Handle, GWL_STYLE, Style or WS_CAPTION or

         WS_BORDER);

     bsDialog: SetWindowLong(Handle, GWL_STYLE,

         Style or WS_CAPTION or DS_MODALFRAME or WS_DLGFRAME);

   end;

   Height := Height + GetSystemMetrics(SM_CYCAPTION);

   Refresh;

end;

end;

procedure TForm1.Button1Click(Sender: TObject);

begin

HideTitlebar;

end;

procedure TForm1.Button2Click(Sender: TObject);

begin

ShowTitlebar;

end;