Remove white border across the Tab control

I am implementing a tab sheet but I AM SEEING A WHITE BORDER around the
whole tab control which looks quite odd.
To remove the border I added the code in PreCreateWindow
cs.style &= ~WS_BORDER;
But this does not work.I also tried to override DrawItem but this does
not work either.
void CMainTabCtrl::DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct)
{
char szTabText[100];
TC_ITEM tci;

memset(szTabText, '\0', sizeof(szTabText));

tci.mask = TCIF_TEXT;
 tci.pszText = (LPWSTR)szTabText;
 tci.cchTextMax = sizeof(szTabText)-1;

 GetItem(lpDrawItemStruct->itemID, &tci);
 CDC *dc = CDC::FromHandle(lpDrawItemStruct->hDC);
 CBrush backBrush(RGB(56, 56, 56));
    dc->FillRect(&lpDrawItemStruct->rcItem, &backBrush);
    dc->SetBkColor(RGB(56,56,56));

    //dc->SetBkMode(TRANSPARENT);
    dc->SetTextColor(RGB(255,255,255));
    //dc->FillRect(&lpdis->rcItem, cbr);
    // dc->SetBkColor(RGB(0,0,0));
        TextOut(lpDrawItemStruct->hDC,
             lpDrawItemStruct->rcItem.left,
             lpDrawItemStruct->rcItem.top,
             tci.pszText,
             lstrlen(tci.pszText));

    // TODO: Add your code to draw the specified item

    // TODO: Add your code to draw the specified item
}

Pls guide