type 
  TForm1 = class(TForm) 
  ... 
  ... 
  public 
    procedure CreateParams(var Params: TCreateParams); override; 
  end; 
 
var 
  Form1: TForm1; 
 
implementation 
 
{$R *.DFM} 
 
procedure TForm1.CreateParams(var Params: TCreateParams); 
begin 
  SystemParametersInfo($1025, 0, PChar(True), 0); 
  inherited; 
  Params.WindowClass.Style := Params.WindowClass.Style or 131072; 
end;