Win32 API spørgsmål (C++)

Kode 

#include "resource.h"
#include <windows.h>
#include <iostream>

HINSTANCE hInsta;
int Show;
void NewGame();
void Settings();
void Rules();
void About();
void InitPop();


std::string table[8][8];
//Første = x, anden = y
//Hvis hvid har feltet = 1
//Hvis sort har feltet = 2
//Hvis feltet er tomt = 0

LRESULT CALLBACK MainWndProc(HWND hwnd, UINT nMsg, WPARAM wParam, LPARAM lParam);
HWND hwnd;
HWND popup;
WNDCLASSEX wc;
WNDCLASSEX pop;
HBITMAP g_hbmBall = NULL;

int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrev, LPSTR lpCmd, int nShow)
{
    g_hbmBall = LoadBitmap(GetModuleHandle(NULL), MAKEINTRESOURCE(BALL));
 Show = nShow;
 MSG msg;
 hInsta = hInst;
 
    wc.cbSize        = sizeof(WNDCLASSEX);
    wc.style         = CS_HREDRAW | CS_VREDRAW;
    wc.lpfnWndProc   = MainWndProc;
    wc.cbClsExtra    = 0;
    wc.cbWndExtra    = 0;
    wc.hInstance     = hInst;
    wc.hCursor       = LoadCursor(NULL, IDC_ARROW);
    wc.hbrBackground = (HBRUSH)(COLOR_BTNFACE+1);
    wc.lpszMenuName  = MAKEINTRESOURCE(IDR_MYMENU);
    wc.lpszClassName = "WndClass";
    wc.hIcon         = LoadIcon(GetModuleHandle(NULL), MAKEINTRESOURCE(IDI_MYICON));
    wc.hIconSm       = (HICON)LoadImage(GetModuleHandle(NULL), MAKEINTRESOURCE(IDI_MYICON), IMAGE_ICON, 16, 16, 0);
 
 RegisterClassEx(&wc);
 
 hwnd = CreateWindowEx(WS_EX_CLIENTEDGE,
 "WndClass",
 "Dam V. 1.0",
 WS_OVERLAPPEDWINDOW,
 CW_USEDEFAULT, CW_USEDEFAULT, 700, 700,
 NULL,
 NULL,
 hInst,
 NULL);
 
 ShowWindow(hwnd, Show);
 UpdateWindow(hwnd);
 
 while(GetMessage(&msg, NULL, 0, 0) > 0)
{
 TranslateMessage(&msg);
 DispatchMessage(&msg);                        
}   
    return msg.wParam;
}

LRESULT CALLBACK MainWndProc(HWND hwnd, UINT nMsg, WPARAM wParam, LPARAM lParam)
{
        switch(nMsg)
        {
         case WM_DESTROY:
              PostQuitMessage(0);
         break;
         
  case WM_COMMAND:
   switch(LOWORD(wParam))
   {
     case ID_FILE_EXIT:
       PostMessage(hwnd, WM_CLOSE, 0, 0);
     break;
     
     case ID_FILE_NEW:
       NewGame();
     break;
     
     case ID_FILE_SETTINGS:
       Settings();
     break;
     
     case ID_FILE_ABOUT:
       InitPop();
       About();
       MessageBox(NULL, table[1][1],"Test",MB_OK);
     break;
     
     case ID_FILE_RULES:
       Rules();
     break;
     
     case WM_DESTROY:
          PostQuitMessage(0);
     break;
     }
     break;
                 
    default:
    return DefWindowProc(hwnd, nMsg, wParam, lParam);
    }    
}

void NewGame()
{
  //række 1 (talt nedefra)
  table[0][0] = "2";
  table[0][1] = "0";
  table[0][2] = "2";
  table[0][3] = "0";
  table[0][4] = "2";
  table[0][5] = "0";
  table[0][6] = "2";
  table[0][7] = "0";
  //række 2
  table[1][0] = "0";
  table[1][1] = "2";
  table[1][2] = "0";
  table[1][3] = "2";
  table[1][4] = "0";
  table[1][5] = "2";
  table[1][6] = "0";
  table[1][7] = "2";
  //række 3
  table[2][0] = "2";
  table[2][1] = "0";
  table[2][2] = "2";
  table[2][3] = "0";
  table[2][4] = "2";
  table[2][5] = "0";
  table[2][6] = "2";
  table[2][7] = "0";
  //række 4
  table[3][0] = "0";
  table[3][1] = "0";
  table[3][2] = "0";
  table[3][3] = "0";
  table[3][4] = "0";
  table[3][5] = "0";
  table[3][6] = "0";
  table[3][7] = "0";
  //række 5
  table[4][0] = "0";
  table[4][1] = "0";
  table[4][2] = "0";
  table[4][3] = "0";
  table[4][4] = "0";
  table[4][5] = "0";
  table[4][6] = "0";
  table[4][7] = "0";
  //række 6
  table[5][0] = "0";
  table[5][1] = "1";
  table[5][2] = "0";
  table[5][3] = "1";
  table[5][4] = "0";
  table[5][5] = "1";
  table[5][6] = "0";
  table[5][7] = "1";
  //række 7
  table[6][0] = "1";
  table[6][1] = "0";
  table[6][2] = "1";
  table[6][3] = "0";
  table[6][4] = "1";
  table[6][5] = "0";
  table[6][6] = "1";
  table[6][7] = "0";
  //række 8
  table[7][0] = "0";
  table[7][1] = "1";
  table[7][2] = "0";
  table[7][3] = "1";
  table[7][4] = "0";
  table[7][5] = "1";
  table[7][6] = "0";
  table[7][7] = "1";
}

void Settings()
{
     
}

void About()
{
  popup = CreateWindowEx(WS_EX_CLIENTEDGE,"PopClass", "Om", WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, 300, 300, hwnd, NULL, hInsta, NULL);  
  ShowWindow(popup, Show);
  UpdateWindow(popup);
}

void Rules()
{
     
}

void InitPop()
{
    pop.cbSize        = sizeof(WNDCLASSEX);
    pop.style         = CS_HREDRAW | CS_VREDRAW;
    pop.lpfnWndProc   = MainWndProc;
    pop.cbClsExtra    = 0;
    pop.cbWndExtra    = 0;
    pop.hInstance     = hInsta;
    pop.hCursor       = LoadCursor(NULL, IDC_ARROW);
    pop.hbrBackground = (HBRUSH)(COLOR_BTNFACE+1);
    pop.lpszMenuName  = NULL;
    pop.lpszClassName = "PopClass";
    pop.hIcon  = NULL;
    pop.hIconSm  = NULL;
 
 RegisterClassEx(&pop);     
}