~很急关于子窗体的有关问题orz

求助~~~~~很急~~~关于子窗体的问题orz
我在BCB里写了一个简单的窗体而后封装成DLL,由DELPHI调用,在DELPHI的MAINMENU中将BCB   的窗体调用出来,但是我将它设置为子窗体就报错
Cannot   create   form.No   MDI   forms   are   currently   active.都快崩溃了,不知道该怎么办啦~~大家帮帮忙~!
BCB中的代码:
USERES( "cheshi1.res ");
USEFORM( "csForm1.cpp ",   cForm1);
TcForm1*   DllMyForm;
extern   "C "   __declspec(dllexport)   __stdcall   void   CreateFromFunct();
//---------------------------------------

#pragma   argsused
int   WINAPI   DllEntryPoint(HINSTANCE   hinst,   unsigned   long   reason,   void*)
{
    return   1;
}
//---------------------------------------

void   __stdcall   CreateFromFunct()
{
    DllMyForm   =   new   TcForm1(Application);
    DllMyForm-> FormStyle   =   fsMDIChild;
    DllMyForm-> Show();
}
//---------------------------------------

DELPHI中的调用
implementation
    procedure   CreateFromFunct();   stdcall   external   'dll1\ceshi1.dll ';

{$R   *.DFM}

procedure   TYourForm.N21Click(Sender:   TObject);
begin
    CreateFromFunct();
end;

------解决方案--------------------
CreateFromFunct需要传入调用程序的Application句柄

void __stdcall CreateFromFunct(HWND hApp)
{
Application-> Handle=hApp;
DllMyForm = new TcForm1(Application);
DllMyForm-> FormStyle = fsMDIChild;
DllMyForm-> Show();
}