HOWTO: CXTPControlCustom background in ribbon?

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Hi;

I created a custom control derived from CWnd that contains a CEdit (masked) and a CXTPButton. This control ist used in dialogs and views and now I want to use this control as a CXTPControlCustom in my apps ribbon bar.
So far so good, but I can't find out how to handle the background drawing when contained in riboon (see screenshot).
For skinned dialogs the  background drawing is ok, but in ribbons not!

Here's my OnPaint() function of the CWnd derived custom control:

void CXRTimeStampCtrl::OnPaint()
{
    CPaintDC dc(this); // device context for painting

    CRect rect;

    DWORD dwStyle=GetStyle();

    GetClientRect(&rect);

    if (BackColor_!=0xFFFFFFFF)
        dc.FillSolidRect(rect, BackColor_);
    else {
        HBRUSH hBrush=reinterpret_cast<HBRUSH>(GetParent()->SendMessage(WM_CTLCOLORSTATIC, reinterpret_cast<WPARAM>(dc.m_hDC), reinterpret_cast<LPARAM>(m_hWnd)));
        dc.FillSolidRect(rect, dc.GetBkColor());
    }
    if (dwStyle & TSCS_SHOWCAPTION)
    {
        CFont* pOldFont=dc.SelectObject(&_fontCaption);
        CString strText;
        GetWindowText(strText);
        dc.DrawText(strText, rect, DT_LEFT|DT_END_ELLIPSIS|DT_SINGLELINE|DT_VCENTER);
        if (pOldFont)
            dc.SelectObject(pOldFont);
    }
}

And here's the result in ribbon (left) and dialog (right):

Any help is very welcome!