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      with TTabSheet.Create(Self) do
        begin
          PageControl := PageControl1;
          PageControl1.Left := 5;
          PageControl1.Top := 370;
          Caption := ' Adresse ';
          PageControl1.TabIndex := 1;
          PageIndex := 1;
        end;

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var
  NewTabSheet: TTabSheet;
begin
  NewTabSheet := TTabSheet.Create(Self);
  NewTabSheet.PageControl := PageControl1;
  NewTabSheet.Caption := 'Adresse';
  NewTabSheet.PageControl.TabIndex := NewTabSheet.TabIndex;
  GroupBox1.Parent := NewTabSheet;