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[...]

  private
    { Private-Deklarationen }
    start_lok_Edit:      Array[1..10] of TEdit;

[...]

start_lok_Edit[i].OnClick := OnClick_ChooseStartRoot(Self);

[...]

procedure TForm2.OnClick_ChooseStartRoot(Sender: TObject);

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start_lok_Edit[i].OnClick := OnClick_ChooseStartRoot;					

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start_lok_Edit[i].OnClick := OnClick_ChooseStartRoot;  
[...]					

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type
  TForm1 = class(TForm)
    Button1: TButton;
    procedure FormCreate(Sender: TObject);
  private
    procedure myClick(Sender : TObject);
    { Private-Deklarationen }
  public
    { Public-Deklarationen }
  end;

{...}

procedure TForm1.FormCreate(Sender: TObject);
begin
  button1.OnClick := myClick;
end;