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I created CToolBarDialog from CExtResizableDialog like :
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class CToolBarDialog : public CExtResizableDialog
{
    class CInnerToolControlBar : public CExtToolControlBar
    {
        virtual CExtBarContentExpandButton * OnCreateBarRightBtn()
        {
            return NULL;
        }
    };
public:
    CInnerToolControlBar m_wndToolBar;
    CExtWFF<CTreeCtrl> m_wndTreeCtrl;
public:
    CToolBarDialog(CWnd* pParent = NULL); // standard constructor
    virtual ~CToolBarDialog();
    enum { IDD = IDD_DIALOG_WITH_TOOLBAR };
protected:
    virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support

    DECLARE_MESSAGE_MAP()
public:
    virtual BOOL OnInitDialog(){
    CExtResizableDialog::OnInitDialog();

    ShowSizeGrip(FALSE);
    m_wndToolBar.LoadToolBar(IDR_SEC_TOOLBAR);
static UINT arrTbBtn[] =
{
    ID_TD_BTN1,
    ID_TD_BTN2,
    ID_TD_BTN3,
    ID_SEPARATOR,
    ID_TD_BTN4,
};
    VERIFY(
        m_wndToolBar.SetButtons(arrTbBtn,
        sizeof(arrTbBtn)/sizeof(arrTbBtn[0]))
        );
    ShowSizeGrip(FALSE);

    CProfStudioThinFrame * pWndThinFrame = new CProfStudioThinFrame;
    if( ! pWndThinFrame->
        CreateDynamicThinFrame( &m_wndTreeCtrl )
        )
    {
        ASSERT( FALSE );
        return FALSE;
    }

    RepositionBars( 0, 0xFFFF, IDC_TREE1 );
    }
public:
    afx_msg void OnSize(UINT nType, int cx, int cy);
public:
    afx_msg void OnSetFocus(CWnd* pOldWnd);
};
-----------------------------------------------------------------------------------------------
[In MainFrm]

CExtControlBar m_wndResizableBarDlg_Custom;
CToolBarDialog m_wndDockedResizedDialog_Custom;

if(    !m_wndResizableBarDlg_Custom.Create( //this is success
        _T("PLZ"),
        this,
        ID_TB_DIALOG,
        WS_CHILD|WS_VISIBLE|CBRS_TOP|CBRS_GRIPPER
        |CBRS_TOOLTIPS
        |CBRS_FLYBY
        |CBRS_SIZE_DYNAMIC
        |CBRS_HIDE_INPLACE
        )
        )
    {
        TRACE0("Failed to create m_wndResizableBarDlg\n");
        return -1;        
    }

    ////////////////////////////////////////////////////////////////////////
    // m_wndDockedResizedDialog_Custom was NOT created!!!!!!!!!!
    
    if( !m_wndDockedResizedDialog_Custom.Create(
        CToolBarDialog::IDD,
        &m_wndResizableBarDlg_Custom
        )
        )
    {
        TRACE0("Failed to create m_wndResizableBarDlg\n");
        //return -1;        // fail to create
    }

--------------------------------------------------------------------------------------------------

m_wndDockedResizedDialog_Custom is NULL !!!!!
let me know how to resolve this problem...

The most probable cause of the problem is invalid subclassing of dialog controls. Please check all the lines in the CToolBarDialog::DoDataExchange() method. You should comment all the lines corresponding to dialog controls and then uncomment them line by line and run your project. This should help.

Please also make sure that you added the following line to the DoDataExchange procedure:

DDX_Control( pDX, IDC_TOOLBAR, m_wndToolBar );