Edit box

Hi! I've been trying to make this work. The problem is, when I click on the edit box, the dialog box closes. Can anyone see the problem here? Thanks! Here's the code:
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// ModelessBox.cpp : Defines the entry point for the application.
//

#include "stdafx.h"
#include "ModelessBox.h"

#define MAX_LOADSTRING 100

// Global Variables:
HINSTANCE hInst;								// current instance
TCHAR szTitle[MAX_LOADSTRING];					// The title bar text
TCHAR szWindowClass[MAX_LOADSTRING];			// the main window class name

// Forward declarations of functions included in this code module:
ATOM				MyRegisterClass(HINSTANCE hInstance);
BOOL				InitInstance(HINSTANCE, int);
LRESULT CALLBACK	WndProc(HWND, UINT, WPARAM, LPARAM);
INT_PTR CALLBACK	About(HWND, UINT, WPARAM, LPARAM);
HWND ghDlg;



BOOL CALLBACK EditDlgProc(HWND hDlg,UINT msg,
						WPARAM wParam,LPARAM lParam)
{
	TCHAR msgText[256];

	HWND hEditBox=0;

	switch(msg)
	{
	case WM_INITDIALOG:
		hEditBox=GetDlgItem(ghDlg,IDC_MSGTEXT);
		SetWindowText(hEditBox,L"Enter Message Here");
		return true;

	case WM_COMMAND:
		switch(LOWORD(wParam))
		{
		case IDB_MSG:
			GetWindowText(hEditBox,msgText,256);
			MessageBox(0,msgText,L"Message",MB_OK);
			return true;


		}


	case WM_CLOSE:
		DestroyWindow(hDlg);
		return 0;

	case WM_DESTROY:
		PostQuitMessage(0);
		return 0;
	}

	return false;

}


int APIENTRY _tWinMain(HINSTANCE hInstance,
                     HINSTANCE hPrevInstance,
                     LPTSTR    lpCmdLine,
                     int       nCmdShow)
{
	UNREFERENCED_PARAMETER(hPrevInstance);
	UNREFERENCED_PARAMETER(lpCmdLine);

 	// TODO: Place code here.
	MSG msg;
	HACCEL hAccelTable;

	// Initialize global strings
	LoadString(hInstance, IDS_APP_TITLE, szTitle, MAX_LOADSTRING);
	LoadString(hInstance, IDC_MODELESSBOX, szWindowClass, MAX_LOADSTRING);
	MyRegisterClass(hInstance);

	// Perform application initialization:
	/*if (!InitInstance (hInstance, nCmdShow))
	{
		return FALSE;
	}*/

	ghDlg=CreateDialog(hInstance,MAKEINTRESOURCE(IDD_MSGDLG),0,EditDlgProc);
	ShowWindow(ghDlg,nCmdShow);

	hAccelTable = LoadAccelerators(hInstance, MAKEINTRESOURCE(IDC_MODELESSBOX));

	// Main message loop:
	while (GetMessage(&msg, NULL, 0, 0))
	{
		if (ghDlg==0 ||!IsDialogMessage(ghDlg,&msg))
		{
			TranslateMessage(&msg);
			DispatchMessage(&msg);
		}
	}

	return (int) msg.wParam;
}



//
//  FUNCTION: MyRegisterClass()
//
//  PURPOSE: Registers the window class.
//
//  COMMENTS:
//
//    This function and its usage are only necessary if you want this code
//    to be compatible with Win32 systems prior to the 'RegisterClassEx'
//    function that was added to Windows 95. It is important to call this function
//    so that the application will get 'well formed' small icons associated
//    with it.
//
ATOM MyRegisterClass(HINSTANCE hInstance)
{
	WNDCLASSEX wcex;

	wcex.cbSize = sizeof(WNDCLASSEX);

	wcex.style			= CS_HREDRAW | CS_VREDRAW;
	wcex.lpfnWndProc	= WndProc;
	wcex.cbClsExtra		= 0;
	wcex.cbWndExtra		= 0;
	wcex.hInstance		= hInstance;
	wcex.hIcon			= LoadIcon(hInstance, MAKEINTRESOURCE(IDI_MODELESSBOX));
	wcex.hCursor		= LoadCursor(NULL, IDC_ARROW);
	wcex.hbrBackground	= (HBRUSH)(COLOR_WINDOW+1);
	wcex.lpszMenuName	= MAKEINTRESOURCE(IDC_MODELESSBOX);
	wcex.lpszClassName	= szWindowClass;
	wcex.hIconSm		= LoadIcon(wcex.hInstance, MAKEINTRESOURCE(IDI_SMALL));

	return RegisterClassEx(&wcex);
}

//
//   FUNCTION: InitInstance(HINSTANCE, int)
//
//   PURPOSE: Saves instance handle and creates main window
//
//   COMMENTS:
//
//        In this function, we save the instance handle in a global variable and
//        create and display the main program window.
//
BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
{
   HWND hWnd;

   hInst = hInstance; // Store instance handle in our global variable

   hWnd = CreateWindow(szWindowClass, szTitle, WS_OVERLAPPEDWINDOW,
      CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, NULL, NULL, hInstance, NULL);

   if (!hWnd)
   {
      return FALSE;
   }

   ShowWindow(hWnd, nCmdShow);
   UpdateWindow(hWnd);

   return TRUE;
}

//
//  FUNCTION: WndProc(HWND, UINT, WPARAM, LPARAM)
//
//  PURPOSE:  Processes messages for the main window.
//
//  WM_COMMAND	- process the application menu
//  WM_PAINT	- Paint the main window
//  WM_DESTROY	- post a quit message and return
//
//
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
	int wmId, wmEvent;
	PAINTSTRUCT ps;
	HDC hdc;

	switch (message)
	{
	case WM_COMMAND:
		wmId    = LOWORD(wParam);
		wmEvent = HIWORD(wParam);
		// Parse the menu selections:
		switch (wmId)
		{
		case IDM_ABOUT:
			DialogBox(hInst, MAKEINTRESOURCE(IDD_ABOUTBOX), hWnd, About);
			break;
		case IDM_EXIT:
			DestroyWindow(hWnd);
			break;
		default:
			return DefWindowProc(hWnd, message, wParam, lParam);
		}
		break;
	case WM_PAINT:
		hdc = BeginPaint(hWnd, &ps);
		// TODO: Add any drawing code here...
		EndPaint(hWnd, &ps);
		break;
	case WM_DESTROY:
		PostQuitMessage(0);
		break;
	default:
		return DefWindowProc(hWnd, message, wParam, lParam);
	}
	return 0;
}

// Message handler for about box.
INT_PTR CALLBACK About(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)
{
	UNREFERENCED_PARAMETER(lParam);
	switch (message)
	{
	case WM_INITDIALOG:
		return (INT_PTR)TRUE;

	case WM_COMMAND:
		if (LOWORD(wParam) == IDOK || LOWORD(wParam) == IDCANCEL)
		{
			EndDialog(hDlg, LOWORD(wParam));
			return (INT_PTR)TRUE;
		}
		break;
	}
	return (INT_PTR)FALSE;
}
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    case WM_COMMAND:
        switch(LOWORD(wParam))
        {
        case IDB_MSG:
            GetWindowText(hEditBox,msgText,256);
            MessageBox(0,msgText,L"Message",MB_OK);
            return true;
            
           //Any other WM_COMMAND case is not handled - so this
           //switch statement will drop through to the WM_CLOSE
           //which we obviously don't want.

        }


    case WM_CLOSE:
        DestroyWindow(hDlg);
        return 0;


The WM_COMMAND switch is incomplete (not terminated properly)
Any unused WM_COMMANDs will drop through and trigger the WM_CLOSE
case.

Put a default case label in the WM_COMMAND switch
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    case WM_COMMAND:
        switch(LOWORD(wParam))
        {
        case IDB_MSG:
            GetWindowText(hEditBox,msgText,256);
            MessageBox(0,msgText,L"Message",MB_OK);
            return true; //Shouldn't this be return 0  ????

          default: //Add a default case
          return 0;


        }


Another option is:
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    case WM_COMMAND:
        switch(LOWORD(wParam))
        {
        case IDB_MSG:
            GetWindowText(hEditBox,msgText,256);
            MessageBox(0,msgText,L"Message",MB_OK);
            return true;

        }

      return 0; //catch any unused WM_COMMAND cases.

    case WM_CLOSE:
        DestroyWindow(hDlg);
        return 0;

But I think the one with the default case is the clearer option.
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