unit Unit1;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls;
type
TForm1 = class(TForm)
btnAddButton: TButton;
btnDeleteLast: TButton;
procedure btnAddButtonClick(Sender: TObject);
procedure btnDeleteLastClick(Sender: TObject);
private
{ Private declarations }
procedure CustomButtonClick(Sender: TObject);
public
{ Public declarations }
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
procedure TForm1.btnAddButtonClick(Sender: TObject);
var
NewButton: TButton;   // 新 Button的指针
begin
// 在内存中创建一个 Button，拥有者为self，这样当窗体 destory时，这个新button
// 能够被自动释放
NewButton := TButton.Create(Self);
With NewButton do
begin
Top := 60;          // button 的出现的坐标
Width := 60;        // button 的宽度
Left := Width * (Self.ControlCount - 2);
Parent := Self;     // 指明在那个窗体显示
OnClick := CustomButtonClick;       // 指定button click事件
Caption := 'Button' + IntToStr(Self.ControlCount - 2);
  end;  // with
end;
procedure TForm1.btnDeleteLastClick(Sender: TObject);
begin
// 确定窗体上有新的button
if Self.ControlCount > 2 then
// 删除最后新建的 button
TButton(Controls[ControlCount - 1]).Destroy;
end;
procedure TForm1.CustomButtonClick(Sender: TObject);
begin
// 根据 Sender 来判断哪个新建的button click
ShowMessage(TButton(Sender).Caption + ' Pressed');
end;
end.