Работа с полем Edit ?

void __fastcall TForm1::Edit1KeyPress(TObject *Sender, char &Key)
{
     if(Key==VK_RETURN)
  {
  String s = Edit1->Text;
   for(int i = 1; i < Edit1->MaxLength + Edit1->MaxLength / 2 + 1; i++)
     if(i % 3 == 0) s.Insert(" ", i);
    Edit1->Text = AnsiUpperCase(s);
  }
 
   const String Valid = "1234567890abcdefABCDEF";
   Key = Valid.Pos(Key) ? Key : 0x0;
 
 
}

//---------------------------------------------------------------------------
 
#include <vcl.h>
#pragma hdrstop
 
#include "Unit1.h"
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TForm1 *Form1;
//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
        : TForm(Owner)
{
   MaskEdit1->MaxLength = 16;
}
//---------------------------------------------------------------------------
 
void __fastcall TForm1::MaskEdit1KeyPress(TObject *Sender, char &Key)
{
  const String Valid = "1234567890abcdefABCDEF";
  Key = Valid.Pos(Key) ? Key : 0x0;
}
//---------------------------------------------------------------------------
void __fastcall TForm1::MaskEdit1Exit(TObject *Sender)
{
   String s = MaskEdit1->Text;
   for(int i = 1; i < MaskEdit1->MaxLength + MaskEdit1->MaxLength / 2 + 1; i++)
   if(i % 3 == 0) s.Insert(" ", i);
   MaskEdit1->Text = AnsiUpperCase(s);
}
//---------------------------------------------------------------------------