環境WindowsXP，BCB6.0（UPD4 (English)
Form1（主Form），Form1上有Button1，點擊Button1顯示Form2。
Form2上有一個RadioGroup1和Edit1，在Form2的OnShow事件中，
進行RadioGroup1->ItemIndex = StrToInt(Edit1->Text);賦值操作。Edit1->Text默認值0。
Form2顯示后，在界面上選擇與StrToInt(Edit1->Text)不同的選項后關閉Form2。假設選擇了第二項。
回到Form1，重新打開Form2，這時應該顯示的是RadioGroup1->ItemIndex = 0；
可是結果卻顯示為第二項。


PS：Form1，Form2都是自動創建的Form。

From1.cpp代碼如下
//----------------------------Head Begin-----------------------------------------------
#ifndef Unit1H
#define Unit1H
#include <Classes.hpp>
#include <Controls.hpp>
#include <StdCtrls.hpp>
#include <Forms.hpp>
#include <ExtCtrls.hpp>
//---------------------------------------------------------------------------
class TForm1 : public TForm
{
__published: // IDE-managed Components
        TButton *Button1;
        void __fastcall Button1Click(TObject *Sender);
private: // User declarations
public:  // User declarations
        __fastcall TForm1(TComponent* Owner);
};
//---------------------------------------------------------------------------
extern PACKAGE TForm1 *Form1;
//---------------------------------------------------------------------------
#endif
//---------------------------Head End------------------------------------------------

//---------------------------Cpp Begin------------------------------------------------
#include <vcl.h>
#pragma hdrstop

#include "Unit1.h"
#include "Unit2.h"
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TForm1 *Form1;
//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
        : TForm(Owner)
{
}
//---------------------------------------------------------------------------

void __fastcall TForm1::Button1Click(TObject *Sender)
{
    Form2->Show();
}
//--------------------------Cpp End-------------------------------------------------


Form2代碼如下
//--------------------------Form2  Head Begin-------------------------------------------------

#ifndef Unit2H
#define Unit2H
//---------------------------------------------------------------------------
#include <Classes.hpp>
#include <Controls.hpp>
#include <StdCtrls.hpp>
#include <Forms.hpp>
#include <ExtCtrls.hpp>
//---------------------------------------------------------------------------
class TForm2 : public TForm
{
__published: // IDE-managed Components
    TRadioGroup *RadioGroup1;
    TEdit *Edit1;
    void __fastcall FormShow(TObject *Sender);
private: // User declarations
public:  // User declarations
    __fastcall TForm2(TComponent* Owner);
};
//---------------------------------------------------------------------------
extern PACKAGE TForm2 *Form2;
//---------------------------------------------------------------------------
#endif
//-----------------------------Form2 Head End----------------------------------------------

//-----------------------------From2 Cpp Begin----------------------------------------------

#include <vcl.h>
#pragma hdrstop

#include "Unit2.h"
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TForm2 *Form2;
//---------------------------------------------------------------------------
__fastcall TForm2::TForm2(TComponent* Owner)
    : TForm(Owner)
{
}
//---------------------------------------------------------------------------

void __fastcall TForm2::FormShow(TObject *Sender)
{
    RadioGroup1->ItemIndex = StrToInt(Edit1->Text);

}
//------------------------------From2 Cpp End---------------------------------------------


解決方法：
在TForm2::FormShow加入RadioGroup1->SetFocus(); 

void __fastcall TForm2::FormShow(TObject *Sender)
{
    RadioGroup1->SetFocus(); //加入
    RadioGroup1->ItemIndex = StrToInt(Edit1->Text);

}