public Chart CreateChart(XmlNode ParentNode, string ObjectRealPath,string ObjectName)
{
Chart chart = new Chart (this._document ,null,ParentNode);
chart.ObjectType = "chart";
chart.ObjectName = ObjectName;
chart.ObjectRealPath = ObjectRealPath;
ChartImporter chartimporter = new ChartImporter (chart);
chartimporter.Import ();
return chart;
}