private void CreateLocalStyleContent()
{
XmlNode nodeAutomaticStyles = this.ChartDoc.SelectSingleNode(
"/office:document-content/office:automatic-styles", this.Document .NamespaceManager);
nodeAutomaticStyles.RemoveAll ();
foreach (IStyle style in this.Styles.ToValueList())
{
XmlNode node =this.ChartDoc .ImportNode (style.Node ,true);
nodeAutomaticStyles.AppendChild(node);
}
}