Application hangs in MFC in _AfxNextControl

In MDI application I use CWinFormsControl to host a Windows Forms control. The application is a standard MFC application and the control is implemented in C#. When I open a window containing a Windows Forms control and click on another window (MFC based window) the application hangs. The following is a call stack:

>      mfc80d.dll!_AfxRemoveDefaultButton(CWnd * pWndRoot=0x2117d09c, CWnd * pWndStart=0x0d3c19b0)  Line 483      C++
       mfc80d.dll!_AfxCheckDefPushButton(CWnd * pWndRoot=0x2117d09c, CWnd * pWndOldFocus=0x1926dddc, CWnd * pWndNewFocus=0x0d42f6b0)  Line 549      C++
       mfc80d.dll!COccManager::IsDialogMessageA(CWnd * pWndDlg=0x2117d09c, tagMSG * lpMsg=0x0015d790)  Line 816      C++
       mfc80d.dll!CWnd::IsDialogMessageA(tagMSG * lpMsg=0x0015d790)  Line 195 + 0x20 bytes      C++
       mfc80d.dll!CWnd::PreTranslateInput(tagMSG * lpMsg=0x0015d790)  Line 4268      C++
       mfc80d.dll!CControlBar::PreTranslateMessage(tagMSG * pMsg=0x0015d790)  Line 443 + 0xc bytes      C++
       mfc80d.dll!CWnd::WalkPreTranslateTree(HWND__ * hWndStop=0x00080aee, tagMSG * pMsg=0x0015d790)  Line 2882 + 0x14 bytes      C++
       mfc80d.dll!AfxInternalPreTranslateMessage(tagMSG * pMsg=0x0015d790)  Line 233 + 0x12 bytes      C++
       mfc80d.dll!CWinThread::PreTranslateMessage(tagMSG * pMsg=0x0015d790)  Line 773 + 0x9 bytes      C++
       mfc80d.dll!AfxPreTranslateMessage(tagMSG * pMsg=0x0015d790)  Line 252 + 0x11 bytes      C++
       mfc80d.dll!AfxInternalPumpMessage()  Line 178 + 0x18 bytes      C++
       mfc80d.dll!CWinThread::PumpMessage()  Line 896      C++
       mfc80d.dll!CWinThread::Run()  Line 625 + 0xd bytes      C++
       mfc80d.dll!CWinApp::Run()  Line 894      C++
       mfc80d.dll!AfxWinMain(HINSTANCE__ * hInstance=0x00400000, HINSTANCE__ * hPrevInstance=0x00000000, char * lpCmdLine=0x00151f05, int nCmdShow=5)  Line 47 + 0xd bytes      C++
       Netedit.exe!WinMain(HINSTANCE__ * hInstance=0x00400000, HINSTANCE__ * hPrevInstance=0x00000000, char * lpCmdLine=0x00151f05, int nCmdShow=5)  Line 33      C++
       Netedit.exe!__tmainCRTStartup()  Line 589 + 0x35 bytes      C
       Netedit.exe!WinMainCRTStartup()  Line 414      C

The application hangs inside MFC in _AfxRemoveDefaultButton method. The code below I copied from _AfxRemoveDefaultButton:

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


_AfxNextControl always returns the same window and AfxRemoveDefaultButton is stuck in the loop.
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