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CTabCtrl hangs up in _AfxRemoveDefaultButton

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I am using a CTabCtrl with embedded CHtmlCtrl objects. If a CButton has the focus when I tab between dialogs the code gets hung up in the do{}while section of the code listed below. I have made sure that the DS_CONTROL flag has been set. I am starting to believe that it has to do with the CHtmlCtrl controls. Anyone have a clue how to fix this. Thanks.

AFX_STATIC void AFXAPI _AfxRemoveDefaultButton(CWnd* pWndRoot, CWnd* pWndStart)
if ((pWndStart == NULL) || IsControlParent(pWndStart))
pWndStart = _AfxGetChildControl(pWndRoot, pWndStart);

if (pWndStart == NULL)

CWnd* pWnd = pWndStart;
CWnd* pWndNext;

COccManager::SetDefaultButton(pWnd, FALSE);
pWndNext = _AfxNextControl(pWndRoot, pWnd, 0);
pWnd = pWndNext;
while ((pWnd != NULL) && (pWnd != pWndStart));
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