访问Delphi BPL中的公共方法和属性

此表单是主应用程序的可选选项.

BPL正确加载,表单显示正确,但我不知道如何访问bpl中表单的公共方法和属性.

有谁可以提供一个简单的例子？

我的代码：

// Load the BPL on aplication Load
LoadPackage( 'About.bpl' );

// CAll for TForm1 inside the About.BPL
var
  AClass: TClass;
  AForm: TForm;
begin

    AClass := GetClass('TForm1');
    if AClass <> nil then
  begin
        Application.CreateForm(TComponentClass(AClass),AForm);
        AForm.Show;
    end;

// The unit TForm1 inside the BPL package
unit Unit1;

interface

uses
    Windows,Messages,SysUtils,Variants,Classes,Graphics,Controls,Forms,Dialogs,StdCtrls;

type
    TForm1 = class(TForm)
        Button1: TButton;
        Label1: TLabel;
        procedure Button1Click(Sender: TObject);
    private
        { Private declarations }
    public
        { Public declarations }
        PublicMthd;
    end;

var
    Form1: TForm1;

implementation

{$R *.dfm}

Procedure TForm1.PublicMthd;
Begin
    ShowMessage('Inside call');
End;

initialization
    RegisterClass(TForm1);

finalization
    UnRegisterClass(TForm1);

end.

如何在Tform1中访问“PublicMthd”？