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Steps:

1. Create a new background class CMyBackShape that uses CFOBackShape as base class.

2. Loading a image file and draw the new background with codes:

void CMyBackShape::OnDrawBack(CDC *pDC,const CRect &rcClip)
{
	CFOBackShape::OnDrawBack(pDC,rcClip);
	CDC memDC;
	memDC.CreateCompatibleDC(pDC);
	CBitmap* pOldBitmap = memDC.SelectObject(&m_Bitmap);
	
	CRect rcBound = m_pModel->GetPagePosition();
    if(!pDC->IsPrinting())
	{
        pDC->StretchBlt(rcBound.left, rcBound.top, 
            m_nImageWidth, m_nImageHeight, &memDC, 0,0,
            m_nImageWidth,
            m_nImageHeight,
            SRCCOPY );   
	}
	else
	{
		SetStretchBltMode( pDC->m_hDC, HALFTONE);       
		FOBitmapPrint(pDC,(HBITMAP)m_Bitmap, 24, rcBound.left, rcBound.top, m_nImageWidth, m_nImageHeight);
	}
	memDC.SelectObject(pOldBitmap);
	memDC.DeleteDC();

}

3. Replace the default background:

void CExtDataModel::DoInitData()
{
	CFODataModel::DoInitData();

	//FOTO:Add you code here.
	SetBackDrawComp(new CMyBackShape);
}

4. Drawing flags on the canvas:

void CTestMapView::OnIn1() 
{
	// TODO: Add your command handler code here
	if(m_drawshape == FO_COMP_COMPOSITE && m_nCurShapeResID == IDR_COMPSRES1)
	{
		m_action_state = State_SelectNone;
		m_drawshape = FO_COMP_NONE;
		FOSetSystemCursor(IDC_ARROW);
		return;
	}
	StartCustomShapeID(IDR_COMPSRES1);
}

void CTestMapView::OnUpdateIn1(CCmdUI* pCmdUI) 
{
	// TODO: Add your command update UI handler code here
	BOOL bDesign = GetCurrentModel()->IsDesignMode();
	pCmdUI->Enable(bDesign);

	pCmdUI->SetCheck(m_drawshape == FO_COMP_COMPOSITE && m_nCurShapeResID == IDR_COMPSRES1);

}

void CTestMapView::OnIn2() 
{
	// TODO: Add your command handler code here
	if(m_drawshape == FO_COMP_COMPOSITE && m_nCurShapeResID == IDR_COMPSRES2)
	{
		m_action_state = State_SelectNone;
		m_drawshape = FO_COMP_NONE;
		FOSetSystemCursor(IDC_ARROW);
		return;
	}
	StartCustomShapeID(IDR_COMPSRES2);
}

void CTestMapView::OnUpdateIn2(CCmdUI* pCmdUI) 
{
	// TODO: Add your command update UI handler code here
	BOOL bDesign = GetCurrentModel()->IsDesignMode();
	pCmdUI->Enable(bDesign);

	pCmdUI->SetCheck(m_drawshape == FO_COMP_COMPOSITE && m_nCurShapeResID == IDR_COMPSRES2);

}