/// <summary>
/// Initializes the object with the containing subscription object.
/// </summary>
public ComDaDataCallback(ComDaGroup group)
{
// save group.
m_group = group;
// create connection point.
m_connectionPoint = new ConnectionPoint(group.Unknown, typeof(OpcRcw.Da.IOPCDataCallback).GUID);
// advise.
m_connectionPoint.Advise(this);
}