CStatic 控件设置文本，不能重回问题

    CStatic m_page_text_;

m_page_text_.SetWindowText(str);

    CRect rt;
    m_page_text_.GetWindowRect(&rt);
    ScreenToClient(&rt);
    InvalidateRect(&rt);
    UpdateWindow();

可以试试：

CStatic m_page_text_;

CStatic m_page_text_;

m_page_text_.UpdateWindow();

m_page_text_.SetWindowText(str);