property sheet in dialog detecting page change

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MFC

property sheet in dialog detecting page change
Hello Friends
I have propertysheet in one of my dialogs windows in my program.
I created several classes :
CZakladkiBiblioteki drived from CPropertySheet
CReBibPage , CRoBibPage , ... drived from CPropertyPage
(one for each page)
and CBibliotekaDlg drived from CDialog
now I want to change text of editbox in my dialog everytime
when user select another page in propertysheet.

I tried to send my own message from overridden OnInitDialog in CReBibPage , CRoBibPage , ...

GetParent()->SendMessage(UWM_ON_REBIB, (WPARAM) GetDlgCtrlID());

... to my dialog, but window doesn't recive this message.
How to inform dialog window which page is now active in propertysheet?
Use messages or another way?
I would be grateful If someone can help me with this task