Problem adding button to dialog derived from CPrintDialog

I have created a dialog based on CPrintDialog and I want to add a third
button, but everytime I do it does not show up when the form is
displayed and if I add a variable, I get exception errors and the
program crashes. I have encluded the header file below, the .cpp file
is a normal dialog file though I overrode the OnInitDialog and hide some
of the controls. Everything works fine until I try to add a control and
I am not sure exactly what I need to do to make my added control visible.

    Z.K.

#pragma once
#include "afxwin.h"

// CMyDialog dialog

class CMyDialog : public CPrintDialog
{
    DECLARE_DYNAMIC(CMyDialog)

public:
    CMyDialog(BOOL bPrintSetupOnly,
            // TRUE for Print Setup, FALSE for Print Dialog
            DWORD dwFlags = PD_ALLPAGES | PD_USEDEVMODECOPIES | PD_NOPAGENUMS
                | PD_HIDEPRINTTOFILE | PD_NOSELECTION,CWnd* pParent = NULL); //
standard constructor
    virtual ~CMyDialog();

// Dialog Data
    enum { IDD = IDD_MYDIALOG };

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

    DECLARE_MESSAGE_MAP()
public:
    virtual BOOL OnInitDialog();
    CButton m_All;
    CStatic m_FromStatic;
    CEdit m_FromEdit;
    CStatic m_ToStatic;
    CEdit m_ToEdit;
    CStatic m_GroupPrint;

    CStatic m_NumCopies;
    CStatic m_CopyPic;
    CEdit m_NumCopies_Edit;
    CButton m_CollateCheck;
    CStatic m_CopiesGroup;

protected:
    virtual void OnOK();
    virtual void OnCancel();
public:
    CButton m_BtnOk;
    CButton m_BtnCancel;
};