C++ Dll içerisinde Form Oluşturşma

#include <windows.h>
#include "MyForm.h"

void BeginThread()
{
    DllForm::MyForm^ form = gcnew DllForm::MyForm();
    form->Text = "C++ DLL Form";
    form->ShowDialog();
}

BOOL APIENTRY DllMain(HMODULE hModule,
    DWORD  ul_reason_for_call,
    LPVOID lpReserved)
{
    switch (ul_reason_for_call)
    {
    case DLL_PROCESS_ATTACH:
        CreateThread(0, 0, (LPTHREAD_START_ROUTINE)BeginThread, 0, 0, 0);
        break;
    case DLL_THREAD_ATTACH:
    case DLL_THREAD_DETACH:
    case DLL_PROCESS_DETACH:
        break;
    }
    return TRUE;
}