책보면서 다이어리 만들고있는데

void CDiaryView::OnDraw(CDC* pDC)
{
        CString strWeek[7] = {\"일\" , \"월\" , \"화\" , \"수\" , \"목\" , \"금\" , \"토\"};
        CBrush *pOldB, brush(RGB(200,240,255));
        pOldB = pDC->SelectObject(&brush);
        pDC->SetBkMode(TRANSPARENT);
        pDC->RoundRect(10,10,255,290,10,10);
    
        int i,j;
        CString str;
        for(i=0; i<7; i++)
        {
                pDC->RoundRect(weekRect[i],CPoint(5,5));
                if(i==0)
                        pDC->SetTextColor(RGB(255,0,0));
                else if(i==6)
                        pDC->SetTextColor(RGB(0,0,255));
                else
                        pDC->SetTextColor(RGB(0,0,0));
                        pDC->DrawText(strWeek[i],weekRect[i],
                        DT_SINGLELINE|DT_CENTER|DT_VCENTER);
        }
        pDC->SetTextColor(RGB(0,0,0));
        CFont *pOldF, font;
        font.CreateFontA(25,0,0,0,700,0,0,0,1,0,0,0,0,\"궁서체\");
        pOldF= pDC->SelectObject(&font);
        str.Format(\"%4d년 %2d월\", year,month);
        pDC->TextOutA(55,30,str);
        pDC->SelectObject(pOldF);

        
        
}
이코드까지 집어느면  사진같이 나오는데 

그다음에 아래 날짜칸 만들려고 

int total = year-1 + ((year-1)/4 - (year-1)/100 + (year-1)/400);
        if(year%4 == 0 && year%100 != 0 ||year%400 == 0)
                lastDay[1] = 29;
        else
                lastDay[1] = 28;
        for(i=0; i<month-1; i++)
                total += lastDay[i];
        total++;
        week = total %7; 

        CBrush brushBox(RGB(220,220,220));
        pDC->SelectObject(&brushBox);

        for(i=0 ; i<6; i++)
        {
                for(j=0; i<7; j++)
                {
                        pDC->RoundRect(panRect[i][j], CPoint(5,5));
                }
        }

이것을 입력하면 

달력모양이 안뜹니다 저 창을 막 흔들어되면 살짝 보일때도있는데 도대체 왜그런가요?