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procedure TForm1.Start1Click(Sender: TObject);
begin
  Tetris := TTetris.Create(Form1);
end;

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  TTetris = class
  private
    sizeStein: Integer;
    sizeFeldX: Integer;
    sizeFeldY: Integer;
  public
    //...
  end;

constructor TTetris.Create(owner: TWinControl);
begin
  Tetris.PaintSpielfeld(owner);
end;
  //...
procedure TTetris.PaintSpielfeld(eltern: TWinControl);
begin
  sizeStein := (eltern.Height) div 24;   //klappt net
  sizeFeldX := sizeStein*10+1+sizeStein;
  sizeFeldY := sizeStein*20+1+sizeStein;
end;
  //..