changing font of a static text

I am trying to change the font of a static text that I created in the
resource editor in Visual Studio. However, when I run the following
OnCreate function to change the font during initialization:

int UserControls::OnCreate(LPCREATESTRUCT lpCreateStruct)
{
    if (CFormView::OnCreate(lpCreateStruct) == -1) return -1;

    // Get device context
    m_chdc = new CClientDC(this);

    CFont unitfont;
    unitfont.CreatePointFont(60, "MS Shell Dlg", m_chdc);
    unitlabel01.SetFont(&unitfont);

    SetTimer(ADEPTHSLIDER, 1000, NULL); // sampling timer for showing
slider position

    return 0;
}

I encountered a runtime error as shown here (http://imagebin.org/
46581). The breakpoint that the assertion triggered is in this
function:

_AFXWIN_INLINE void CWnd::SetFont(CFont* pFont, BOOL bRedraw)
    { ASSERT(::IsWindow(m_hWnd)); ::SendMessage(m_hWnd, WM_SETFONT,
(WPARAM)pFont->GetSafeHandle(), bRedraw); }

I'm not sure what went wrong with my attempt to change the font. Some
pointers would be helpful.
Thanks.