string RibbonGetContent(IRibbonControl ribbonControl);

 public string RibbonGetContent(IRibbonControl ribbonControl)
		{
 			XmlDocument xmlDoc = new System.Xml.XmlDocument();
 			XmlElement menuElement = xmlDoc.CreateElement("menu");
				menuElement.SetAttribute("xmlns", "http://schemas.microsoft.com/office/2006/01/customui");
 			xmlDoc.AppendChild(menuElement);

 			XmlElement customTest = xmlDoc.CreateElement("menuSeparator");
				customTest.SetAttribute("id", "CustomSeparatorRA1");
				customTest.SetAttribute("title", "Dynamic Report List");
				menuElement.AppendChild(customTest);

 //Here is create a fake list... just to have a list.
 //Replace by the list of element that you want to display
				EPMExcelSheet epmExcelSheet = newEPMExcelSheet(ExcelApplication.ActiveSheet as_Worksheet);
				EPMReportManager reportManager = EPMExcelReportManagerRepository.GetReportManager(epmExcelSheet);
 			List<string> reportList = reportManager.GetReportList();

 			List<KeyValuePair<string, string>> listCustom = newList<KeyValuePair<string, string>>();
 			foreach (string report in reportList)
 			{
 					listCustom.Add(newKeyValuePair<string, string>(report, reportManager.GetReportName(report)));
 			}
 			foreach (KeyValuePair<string, string> keyValue in listCustom)
 			{

 // A Button for each element in the list
				XmlElement element = xmlDoc.CreateElement("button");
 			element.SetAttribute("id", string.Format("Report{0}",keyValue.Key));
				element.SetAttribute("tag", keyValue.Key);
 			element.SetAttribute("label", keyValue.Value);

 //each element must call RibbonOnActionForDynamicExtension as callBack
	//then the method RibbonOnAction will be called each time the user clicks on the button
				element.SetAttribute("onAction", "RibbonOnActionForDynamicExtension");
				menuElement.AppendChild(element);
				}
				return xmlDoc.OuterXml;
				}