Custom CFileDialog with template

Hello,

I follow the example at
http://www.codeproject.com/dialog/fndsoundpreview.asp to create my own
custom CFileDialog-derived class called CImportFileDlg, I dynamically create
a "Select All" button at the bottom of the dialog, but I can never catch the
click event of the button. My code is following:
---ImportFileDlg.h----
/////////////////////////////
#pragma once

// CImportFileDlg
struct OPENFILENAMEEX : public OPENFILENAME
{
 void * pvReserved;
 DWORD dwReserved;
 DWORD FlagsEx;
};

class CImportFileDlg : public CFileDialog
{
 DECLARE_DYNAMIC(CImportFileDlg)

public:
 //Initialization
 CImportFileDlg(BOOL bOpenFileDialog, // TRUE for FileOpen, FALSE for
FileSaveAs
  LPCTSTR lpszDefExt = NULL, //Default Extension
  LPCTSTR lpszFileName = NULL, //Initial filename that appears in the
filename edit box
  DWORD dwFlags = OFN_HIDEREADONLY | OFN_OVERWRITEPROMPT
|OFN_ALLOWMULTISELECT, //A combination of one or more flags that allow you
to customize the dialog box
  CWnd* pParentWnd = NULL, //Parrent Window
  BOOL bAutoPlay = FALSE, //Check the autoplay checkbox on start
  LPCTSTR lpszFilter = "Image Files (*.jpg; *.jpeg)|*.jpg; *.jpeg|*.*||"
  );
 //Destruction
 virtual ~CImportFileDlg();
protected:
 //Overides
 virtual void OnInitDone();
 //{{AFX_VIRTUAL(CImportFileDlg)
 afx_msg void OnTimer(UINT nIDEvent);
 afx_msg void OnSelectAll();
 afx_msg void OnSize(UINT nType, int cx, int cy);
 //}}AFX_VIRTUAL

 //Member Variables

 CButton m_selectAll;

 DECLARE_MESSAGE_MAP()
private:

};

----ImportFileDlg.cpp----
// SoundFileDlg.cpp : implementation file
//
/////////////////////////////
#include "stdafx.h"
#include "ImportFileDlg.h"

//for extended controls:
#define IDC_IMPORTFILE_SELECTALL 6001 //Button
// CImportFileDlg

//IMPLEMENT_DYNAMIC(CImportFileDlg, CFileDialog)
CImportFileDlg::CImportFileDlg(BOOL bOpenFileDialog, LPCTSTR lpszDefExt,
LPCTSTR lpszFileName,
  DWORD dwFlags, CWnd* pParentWnd, BOOL bAutoPlay, LPCTSTR lpszFilter) :
  CFileDialog(bOpenFileDialog, lpszDefExt, lpszFileName, dwFlags,
lpszFilter, pParentWnd)
{

 if(bOpenFileDialog)
 {
        m_ofn.Flags |= OFN_ENABLETEMPLATE;
  m_ofn.Flags |= OFN_ALLOWMULTISELECT;
  m_ofn.lStructSize = sizeof(OPENFILENAMEEX); // sizeof (OPENFILENAME) + 12;
  m_ofn.hInstance = AfxGetInstanceHandle();
  m_ofn.lpTemplateName = "IMPORTFILEDLG_TEMPLATE";
  //IMPORTFILEDLG_TEMPLATE is defined in TestFileDialog.rc2.rc
 }
}

CImportFileDlg::~CImportFileDlg()
{
}

IMPLEMENT_DYNAMIC(CImportFileDlg, CFileDialog)
BEGIN_MESSAGE_MAP(CImportFileDlg, CFileDialog)
 //{{AFX_MSG_MAP(CImportFileDlg)
 ON_WM_TIMER()
 ON_BN_CLICKED(IDC_IMPORTFILE_SELECTALL,OnSelectAll)
 ON_WM_SIZE()
 //}}AFX_MSG_MAP
END_MESSAGE_MAP()

// CImportFileDlg message handlers

void CImportFileDlg::OnInitDone()
{
 CFileDialog::OnInitDone();
 CRect cr,winRect;
 CWnd * pWnd = this->GetParent();
 pWnd->GetWindowRect(winRect);
 pWnd->ScreenToClient(winRect);
 /*
  I realy don't know why but this window (the template)
  doesn't let the dialog paint right in some systems (W2k and ME) when
resizing,
  so I make all non fileDilaog controls be child of the actual dilaog,
  and move the template window to 0,0 an resize it to 0x0.
 */
 SetWindowPos(&wndBottom,0/*::GetSystemMetrics(SM_CXSCREEN)*/,0/*::GetSystemMetrics(SM_CYSCREEN)*/,0,0,0); cr=winRect; CFont *pFont = pWnd->GetFont(); // GetFont(); //SelectAll button cr.top = cr.bottom-50; cr.bottom = cr.top+25; cr.left = cr.left+100; cr.right = cr.left+100; m_selectAll.Create("SelectAll",BS_PUSHBUTTON|WS_CHILD|WS_VISIBLE|WS_TABSTOP,cr,pWnd,IDC_IMPORTFILE_SELECTALL); m_selectAll.SetFont(pFont); //The timer is set to redraw the pre-listen window, //it couldn't be done with OnSize beacuse this object doesn't //resizes when a dialog Resizes. if(m_ofn.Flags & OFN_ENABLESIZING) SetTimer(1,1,NULL);}void CImportFileDlg::OnSelectAll(){ //why is never called??????? AfxMessageBox("OnSelectAll");}void CImportFileDlg::OnTimer(UINT nIDEvent){ if(nIDEvent==1) { //do resize } CFileDialog::OnTimer(nIDEvent);}//it is never called?????void CImportFileDlg::OnSize(UINT nType, int cx, int cy){ AfxMessageBox("OnSize"); CFileDialog::OnSize(nType, cx, cy); // TODO: Add your message handler code here}******************************************************Could you tell me what is wrong with the code?Thanks a lot.Charlie