CBitmapButton m_BT_Dial;
         CTipWnd          m_tip;
         CTipHelper       m_tipHelpers[10];

     // Create bitmap buttons.
         m_BT_Dial.AutoLoad(IDC_BT_DIAL, this, 2); // Subclasses control
 
     UINT uIDs[4] ={IDC_BT_NEW, IDC_BT_MODIFY, IDC_BT_REMOVE, IDC_BT_DIAL};
         for (int i = 0; i < 4; i++)
             m_tipHelpers[i].SubclassDlgItem(uIDs[i], this);   // Also subclasses control.

         m_tip.Create(this, 0);
         m_tip.SetTipBkClr(RGB(255, 255, 0));  // Bright yellow

// The Tip Helper for CBitmapButton
class CTipHlprBmpBtn : public CBitmapButton
{
protected:
    afx_msg void OnMouseMove(UINT nFlags, CPoint point);
    DECLARE_MESSAGE_MAP()
};

BEGIN_MESSAGE_MAP(CTipHlprBmpBtn, CBitmapButton)
    ON_WM_MOUSEMOVE()
END_MESSAGE_MAP()

void CTipHlprBmpBtn::OnMouseMove(UINT nFlags, CPoint point) 
{
    MapWindowPoints(GetParent(), &point, 1);
    GetParent()->SendMessage(WM_MOUSEMOVE, nFlags, 
                             MAKELONG(point.x, point.y));
}