原理见http://202.38.73.222/~pjf/blog/archives/000040.html
代码如下：
============form1.dfm==============
object Form1: TForm1
Left = 192
Top = 107
Width = 396
Height = 261
Caption = 'Form1'
Color = clBtnFace
Font.Charset = DEFAULT_CHARSET
Font.Color = clWindowText
Font.Height = -11
Font.Name = 'MS Sans Serif'
Font.Style = []
OldCreateOrder = False
OnCreate = FormCreate
OnDestroy = FormDestroy
PixelsPerInch = 96
TextHeight = 13
object Button1: TButton
Left = 0
Top = 152
Width = 89
Height = 25
Caption = 'Load'
TabOrder = 0
OnClick = Button1Click
end
object Memo1: TMemo
Left = 0
Top = 0
Width = 385
Height = 145
ScrollBars = ssBoth
TabOrder = 1
end
object Button2: TButton
Left = 0
Top = 184
Width = 89
Height = 25
Caption = 'Button2'
TabOrder = 2
OnClick = Button2Click
end
object Button3: TButton
Left = 120
Top = 184
Width = 89
Height = 25
Caption = 'Button3'
TabOrder = 3
OnClick = Button3Click
end
end
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