MFC Dialog Box Question

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C++

Visual-Studio

MFC

VS2010

So, I am continuing to work through a tutorial and I have run into another 'undeclared identifier' error. I have checked that the definition exists in resource.h, but I still get the error. Again, it is a short tutorial, so here is the code:

//MFC5.CPP - MFC Tutorial Part 5 from CoderSource.net
#include <afxwin.h>
#include "resource.h"
#include "newdialog.h"

class MFC_Tutorial_Window :public CFrameWnd
{
	CMenu menu1;
public:
    MFC_Tutorial_Window()
    {
        Create(NULL,_T("MFC Tutorial Part 5 CoderSource Dialog"));
		menu1.LoadMenu(IDR_MENU1);
        SetMenu(&menu1);
    }
    void OnClickDialogNew();
    DECLARE_MESSAGE_MAP()
};
BEGIN_MESSAGE_MAP( MFC_Tutorial_Window, CFrameWnd)
    ON_COMMAND(ID_MYDIALOG,OnClickDialogNew)
END_MESSAGE_MAP()
void MFC_Tutorial_Window::OnClickDialogNew()
{
    newdialog dlg;
    dlg.DoModal();
}
class MyApp :public CWinApp

The compiler gives me the following error (it is the only error):
newdialog.h(15): error C2065: 'ID_MYDIALOG' : undeclared identifier

The error message brings me to enum { IDD = ID_MYDIALOG }; which is line 15 from the following code.

<pre lang="cs">#pragma once
#include<afxwin.h>

// newdialog dialog

class newdialog : public CDialog
{
    DECLARE_DYNAMIC(newdialog)

public:
    newdialog(CWnd* pParent = NULL);   // standard constructor
    virtual ~newdialog();

// Dialog Data
    enum { IDD = ID_MYDIALOG };

protected:
    virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV support

    DECLARE_MESSAGE_MAP()
};

Any suggestion on where I should look? Also, if there is a recommendation for a tutorial not written for VC6, but for VS2010 it would make things easier. However, I have been learning by my mistakes....

Ok, so I was able to fix the compiler issue by including resource.h (per advice) in the newdialog class...but now the dialog box doesn't show! I included a menu resource, but clicking on 'New' doesn't cause the dialog box to appear.