Lazarus - SelectFirst給出錯誤

Question

我試圖做一個組合框，選擇第一個項目後更改。我的操作系統是Ubuntu 12.04。我的代碼：

unit Unit1; 

{$mode objfpc}{$H+} 

interface 

uses 
    Classes, SysUtils, FileUtil, Forms, Controls, Graphics, Dialogs, StdCtrls, 
    Buttons, Menus; 

type 

    { TForm1 } 

    TForm1 = class(TForm) 
    ComboBox1: TComboBox; 
    Edit1: TEdit; 
    Label1: TLabel; 
    Memo1: TMemo; 
    procedure ComboBox1Change(Sender: TObject); 
    procedure FormCreate(Sender: TObject); 
    private 
    { private declarations } 
    public 
    { public declarations } 
    end; 

var 
    Form1: TForm1; 

implementation 

{$R *.lfm} 

{ TForm1 } 

procedure TForm1.ComboBox1Change(Sender: TObject); 
var Text2:String; 
begin 
    if (Combobox1.ItemIndex = 1) Then 
    begin 
    Text2 := Memo1.SelText; 
    Edit1.Text := Memo1.SelText; 
    Memo1.SelText := '[artist]' + Text2 + '[/artist]'; 
    end; 
    if (Combobox1.ItemIndex = 2) Then 
    begin 
    if (Edit1.Text = '') Then 
    ShowMessage('Artist name is not defined') Else 
    begin 
     Text2 := Memo1.SelText; 
     Memo1.SelText := '[album artist=' + Edit1.Text + ']' + Text2 + '[/album]'; 
    end; 
    end; 
    if (ComboBox1.ItemIndex = 3) Then 
    begin 
    if (Edit1.Text = '') Then 
    ShowMessage('Artist name is not defined') Else 
    begin 
     Text2 := Memo1.SelText; 
     Memo1.SelText := '[track artist=' + Edit1.Text + ']' + Text2 + '[/track]' 
    end; 
    end; 
    if (ComboBox1.ItemIndex = 4) Then 
    begin 
    Text2 := Memo1.SelText; 
    Memo1.SelText := '[label]' + Text2 + '[/label]'; 
    end; 
    if (ComboBox1.ItemIndex = 5) Then 
    begin 
    Text2 := Memo1.SelText; 
    Memo1.SelText := '[tag]' + Text2 + '[/tag]'; 
    end; 
    Combobox1.SelectFirst; 
end; 

procedure TForm1.FormCreate(Sender: TObject); 
begin 
    Memo1.Text := 'Select an item'; 
end; 

end. 

這給出了一個錯誤：unit1.pas（74,13）錯誤：標識符idents沒有成員 「SelectFirst」

我怎樣才能解決這個問題？

Answer 1

組合框沒有此過程 如果你想第一項通過這種方式

ComboBox1.ItemIndex := 0 

選擇它