Using CreateDialogParamA In Win32

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C++

Hi,
I have win32 dll that using CreateDialogParamA function for making small dialog front of Parent window. Parent window is include different windows that each has specific HWND.
Problem is when i can this CreateDialogParamA with unique HWND, this shows dialog for all windows with different HWND.
Is there any C++ function that restrict this dialog to HWND that call that?

// dllmain.cpp : Defines the entry point for the DLL application.
#include "stdafx.h"
#include "resource.h"

HINSTANCE g_hInstance;

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

INT_PTR CALLBACK DialogFunc(HWND hDlg, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
	HMENU hMenu;
	switch(uMsg)
	{
	case WM_INITDIALOG:
		hMenu = LoadMenu(g_hInstance, MAKEINTRESOURCE(IDR_MENU1));
		SetMenu(hDlg, hMenu);
		break;
	case WM_COMMAND:
		switch(LOWORD(wParam))
		{
		case IDC_BUTTON1:
		case ID_FILE_MESSAGEBOX:
			MessageBox(hDlg, "This is sample for Reza", "Test", MB_OK);
			break;
		case IDC_BUTTON2:
		case ID_FILE_EXIT:
			SendMessage(hDlg, WM_CLOSE, 0, 0);
			break;
		

		}
		break;
	case WM_CLOSE:
		DestroyWindow(hDlg);
		return TRUE;
		break;
	case WM_DESTROY: 
		PostQuitMessage (0); 
		return TRUE;
		break; 
	}
	return FALSE;
}

MT4_EXPFUNC int MetaTest(HWND hWnd)
{
	MSG msg; 
	BOOL msgstatus; 

	HWND hDlg = CreateDialogParamA(g_hInstance, MAKEINTRESOURCE(IDD_METATEST), hWnd, DialogFunc, 0);
	ShowWindow(hDlg, SW_SHOW);

	while ((msgstatus=GetMessage (&msg, NULL, 0, 0)) && msgstatus!=-1)
	{ 
		if (! IsDialogMessage (hDlg, &msg)) 
		{ 
			TranslateMessage (&msg);  
			DispatchMessage (&msg); 
		}
	}
	return 0;
}

For example in above code, I call function MetaTest with unique hWnd. I want it shows this dialog for this hWnd, but it shows for other active hWnd in Parent window too.
I want fix that it shows dialog for this hwnd only.
Regards,