private void TestDefaultTransition()
{
int hr;
Guid g = typeof(DxtAlphaSetter).GUID;
Guid g2;
hr = m_pTimeline.SetDefaultTransition(g);
DsError.ThrowExceptionForHR(hr);
hr = m_pTimeline.GetDefaultTransition(out g2);
DsError.ThrowExceptionForHR(hr);
Debug.Assert(g == g2, "GetDefaultTransition");
}