unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    Button1: TButton;
    Button2: TButton;
    ListBox1: TListBox;
    ComboBox1: TComboBox;
    Label1: TLabel;
    Edit1: TEdit;
    Button3: TButton;
    procedure Button3Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
begin
  ListBox1.Items.Add(Edit1.Text);
end;

procedure TForm1.Button2Click(Sender: TObject);
begin
  Listbox1.Items.Add(Inttostr(Random(10)));
end;

procedure TForm1.Button3Click(Sender: TObject);
begin
  Listbox1.Clear;
end;

end.
