1   
2   unit Unit1;
3   
4   interface
5   
6   uses
7     Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
8     Dialogs, StdCtrls;
9   
10  type
11    TForm1 = class(TForm)
12      Memo1: TMemo;
13      Button1: TButton;
14      procedure Button1Click(Sender: TObject);
15      procedure Button2Click(Sender: TObject);
16    private
17      { Private declarations }
18      procedure ShowHideComponent(ComponentName: string;bShow:boolean);
19    public
20      { Public declarations }
21    end;
22  
23  var
24    Form1: TForm1;
25  
26  implementation
27  
28  {$R *.dfm}
29  
30  procedure TForm1.ShowHideComponent(ComponentName: string;bShow:boolean);
31  var
32    TmpComp: TComponent;
33  begin
34    TmpComp := FindComponent(ComponentName);
35    if TmpComp <> nil then
36      if TmpComp is TControl then  begin
37         if bShow then
38         TControl(TmpComp).Show
39         else
40         TControl(TmpComp).Hide;
41        end
42  end;
43  
44  procedure TForm1.Button1Click(Sender: TObject);
45  begin
46  
47    ShowHideComponent('MEMO1',false);
48  end;
49  
50  procedure TForm1.Button1Click(Sender: TObject);
51  begin
52  
53    ShowHideComponent('MEMO1',true);
54  end;
55  
56  end.