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unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, ExtCtrls;

type
  TForm1 = class(TForm)
    procedure FormCreate(Sender: TObject);
  private
    { Private-Deklarationen }
  public
    { Public-Deklarationen }
  end;

var
  Form1: TForm1;
  shape: array [1..25] of TShape;

implementation

{$R *.dfm}

procedure TForm1.FormCreate(Sender: TObject);
var i: integer;
begin
  for i:= 1 to 25 do
    begin
      shape[i]:= TShape.Create(Form1);
      shape[i].Parent:= form1;
      shape[i].Width:= 30;
      shape[i].Height:= 30;
      shape[i].Left:= ((i-1) mod 5) * 30;
      shape[i].Top:= ((i-1) div 5) * 30;
    end;
end;

end.                    

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// im OnCreate
[...]
  for i:= 1 to 25 do
    begin
      shape[i]:= TShape.Create(Form1);
      shape[i].Parent:= form1;
      shape[i].Width:= 30;
      shape[i].Height:= 30;
      shape[i].Left:= ((i-1) mod 5) * 30;
      shape[i].Top:= ((i-1) div 5) * 30;
      shape[i].OnMouseUp := ShapeMouseUp;
    end;

[...]

procedure TForm1.ShapeMouseUp(Sender: TObject; Button: TMouseButton;
  Shift: TShiftState; X, Y: Integer);
begin
  if (Sender is TShape) then
  begin
    TShape(Sender).Shape := stCirle;
  end;
end;