Another question about CXTResizeFormView

Dear support:
I create a form view which is derived from CXTResizeFormView, I want the controls in this form view can be resizable, but I met a strange problem. When I launched my program, the dialog embeded in the form view can not be resizable, but when I maximize the window, It can be resizable. Why?

My code is attached here:

/////////////////////////////////////////////////////////////////////////////
// CFundViewPage

IMPLEMENT_DYNCREATE(CFundViewPage, CXTResizeFormView)

CFundViewPage::CFundViewPage()
    : CXTResizeFormView(CFundViewPage::IDD)
{
    //{{AFX_DATA_INIT(CFundViewPage)
        // NOTE: the ClassWizard will add member initialization here
    //}}AFX_DATA_INIT
}

CFundViewPage::~CFundViewPage()
{
}

void CFundViewPage::DoDataExchange(CDataExchange* pDX)
{
    CXTResizeFormView::DoDataExchange(pDX);
    //{{AFX_DATA_MAP(CFundViewPage)
    DDX_Control(pDX, IDOK, m_btnOK);
    //}}AFX_DATA_MAP
}


BEGIN_MESSAGE_MAP(CFundViewPage, CXTResizeFormView)
    //{{AFX_MSG_MAP(CFundViewPage)
        // NOTE - the ClassWizard will add and remove mapping macros here.
    //}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CFundViewPage diagnostics

#ifdef _DEBUG
void CFundViewPage::AssertValid() const
{
    CXTResizeFormView::AssertValid();
}

void CFundViewPage::Dump(CDumpContext& dc) const
{
    CXTResizeFormView::Dump(dc);
}
#endif //_DEBUG

/////////////////////////////////////////////////////////////////////////////
// CFundViewPage message handlers

void CFundViewPage::OnInitialUpdate()
{
    CXTResizeFormView::OnInitialUpdate();


    SetResize(IDOK, SZ_TOP_LEFT, SZ_TOP_LEFT);
    SetResize(IDCANCEL, SZ_BOTTOM_RIGHT, SZ_BOTTOM_RIGHT);

    SetFormViewStyle();
}

I have resolved it just now, thank you.