Почему DialogBox возвращает (-1) ?

#include <windows.h>
#include <stdio.h>
#include "resource.h"
 
 
 
BOOL CALLBACK DlgProc (HWND hDlg, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
    switch (uMsg)
    {
    case WM_INITDIALOG:
        return FALSE;
    }
 
    return FALSE;
}
 
 
 
int WINAPI WinMain ( HINSTANCE hInstance, HINSTANCE hPrevInstance,
                    LPSTR lpCmdLine, int nShowCmd )
{
    DialogBox (hInstance, MAKEINTRESOURCE (IDD_DIALOG1),
                        NULL, DlgProc);
    return 0;
}

#include "stdafx.h"
#include "Test_ListBox.h"
 
LRESULT CALLBACK    DlgProc(HWND, UINT, WPARAM, LPARAM);
 
int APIENTRY _tWinMain(HINSTANCE hInstance, HINSTANCE, LPTSTR, int){
    DWORD dwTemp;
 
    dwTemp = DialogBox(hInstance, MAKEINTRESOURCE(IDD_DLG), NULL, (DLGPROC)DlgProc);
    dwTemp = GetLastError();
    return (int) 0;
}
 
LRESULT CALLBACK DlgProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam){
 
    switch (message)
    {
    case WM_INITDIALOG:
        break;
    case WM_COMMAND:
        if(wParam == IDCANCEL)
            EndDialog(hWnd, 0x0);
            break;
        break;
    default:
        return FALSE;
    }
    return TRUE;
}

{
    TranslateMessage(&msg);
    DispatchMessage(&msg);
}

   INITCOMMONCONTROLSEX icex;
    // Ensure that the common control DLL is loaded. 
    icex.dwSize = sizeof(INITCOMMONCONTROLSEX);
    icex.dwICC  = ICC_LISTVIEW_CLASSES;
    InitCommonControlsEx(&icex); // To ensure that common controls DLL loads