How to avoid the controls flicking in MFC App

Hello ,Every body:
I would like make friends with you.
I am Ph.Candidate,majoring in Bridge Structural
Engineering .(Southwest jiaotong University ,China)Now ,I am busying my doctoral paper,
the major part of my paper is Windows Programming.
These days ,i have been run into the following question :
I have create a CProgressCtrl object in my PropertySheet(Wizard mode),when I switch from one
page to another ,the CProgressCtrl object always
flicks ,What l want is to how to avoid this problem .Could you tell me how i can deal with.
Remember :your comment can make a great difference
to me !i am eager to waiting your message.
Partial code is given below:

BOOL CModifedProSheet::OnInitDialog()
{
BOOL bResult = CPropertySheet::OnInitDialog();
ModifyStyleEx(0,WS_EX_CONTEXTHELP);
CRect rectWnd;
CRect rect1;
GetClientRect(rectWnd);
CButton *b1=(CButton *)GetDlgItem(ID_WIZNEXT);
b1->GetWindowRect(&rect1);
ScreenToClient(rect1);
rect1.SetRect(rectWnd.left+10,rect1.top-35,rectWnd.Width()-10,rect1.top-15);
//Create m_cProgrss Obeject (derived from the MFC
class CProgressCtrl)
if(!m_cProgress.Create(WS_VISIBLE|WS_CHILD,rect1,this,IDC_PROGRESS))
return FALSE;