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library CallDLL;

uses
  ShareMem,SysUtils, Classes, stdctrls, extctrls, graphics, controls, windows;

{$R *.RES}
type
  TCreateParProc=procedure(var ctrl:TWinControl; WinCtrlClass: TWinControlClass); stdcall;

var btnButton: TButton;

procedure CallDLLProc(CreateParProc: TCreateParProc); stdcall;
begin
  CreateParProc(TWinControl(btnButton), TButton);
  with btnButton do
  begin
    Left:=20;
    Top:=20;
    Width:=80;
    Height:=30;
    Caption:='Test';
    Visible:=True;
  end;
end;

exports
  CallDLLProc;

begin
end.					

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unit Main;

interface

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

type
  TCreateParProc=procedure(var Ctrl: TWinControl; WinCtrlClass: TWinControlClass); stdcall;

  TForm1 = class(TForm)
    Panel1: TPanel;
    Button1: TButton;
    procedure Button1Click(Sender: TObject);
  end;

  procedure CallDLLProc(CreateParProc: TCreateParProc); stdcall;
  procedure CreateParCtrl(var Ctrl: TWinControl; WinCtrlClass: TWinControlClass); stdcall;

var
  Form1: TForm1;

implementation

{$R *.DFM}

procedure CallDLLProc; external 'CallDLL.DLL';

procedure TForm1.Button1Click(Sender: TObject);
begin
  CallDLLProc(@CreateParCtrl);
end;

procedure CreateParCtrl(var Ctrl: TWinControl; WinCtrlClass: TWinControlClass); stdcall;
begin
  Ctrl:=WinCtrlClass.CreateParented(Form1.Panel1.Handle);
  Form1.Panel1.InsertControl(ctrl);
end;

end.					

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procedure TControl.SetFont(Value: TFont);
begin
  FFont.Assign(Value);
end;					

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procedure TFont.Assign(Source: TPersistent);
begin
  if Source is TFont then
  begin
    Lock;
    try
      TFont(Source).Lock;
      try
        FontManager.AssignResource(Self, TFont(Source).FResource);
        Color := TFont(Source).Color;
        if PixelsPerInch <> TFont(Source).PixelsPerInch then
          Size := TFont(Source).Size;
      finally
        TFont(Source).Unlock;
      end;
    finally
      Unlock;
    end;
    Exit;
  end;
  inherited Assign(Source);
end;					

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procedure CallDLLProc(CreateParProc: TCreateParProc); stdcall;
procedure CallDLLProc; external 'CallDLL.DLL';					

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library CallDLL;

uses
  Sharemem,SysUtils, Classes, stdctrls, extctrls, graphics, controls, windows, dialogs, forms;

{$R *.RES}
type
  TDummy=class(TObject)
    procedure ButtonClicked(Sender: TObject);
  end;

var btnButton: TButton;
    dummy: TDummy;
    fExit: Boolean;

procedure TDummy.ButtonClicked(Sender: TObject);
begin
  MessageDlg('Geklickt!',mtInformation,[mbOK],0);
  fExit:=True;
end;

procedure CallDLLProc(Handle: HWND); stdcall;
begin
  btnButton:=TButton.CreateParented(Handle);
  with btnButton do
  begin
    Left:=20;
    Top:=20;
    Width:=80;
    Height:=30;
    Caption:='Test';
    Visible:=True;
    OnClick:=dummy.ButtonClicked;
  end;
  ShowWindow(btnButton.Handle,SW_SHOW);

  fExit:=False;
  repeat
    Application.ProcessMessages;
  until fExit;
end;

exports
  CallDLLProc;

begin
end.					

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CallDLLPRoc(Form1.Panel1.Handle);