Add-ins开发，如何调用ArcMap现有的工具，比如Drawing工具条的Rotate工具。

ESRI.ArcGIS.Framework.ICommandBars commandBars = ArcMap.Application.Document.CommandBars; 

ESRI.ArcGIS.esriSystem.UID commandID = new ESRI.ArcGIS.esriSystem.UIDClass(); 

commandID.Value = esriArcMapUI.RotateElementTool; 

ArcMap.Application.CurrentTool = commandBars.Find(commandID, false, false);