Problem with reshaping polygon feature

[sairam]

Hi,
I have a polygon feature class and my task is to create a tool bar which provides the option of selecting the polygon feature class and reshape it the way we want  and I was trying very hard on this for past two days but I am unable to figure it out what should I do
Finally, what I did is i used the addin button of Arc GIS 10 and wrote the code for the ???reshaping??? the polygon.
The error that I am getting is ???argument missing??? in the onclick() event, could you please provide me suggestions as how to proceed on this and is it the correct way that I am doing. I appreciate if any one can guide me on the right path

using ESRI.ArcGIS.esriSystem;

using ESRI.ArcGIS.Framework;
using System;
using System.Collections.Generic;
using System.Text;
using System.IO;
using ESRI.ArcGIS.ArcMapUI;
using ESRI.ArcGIS.Carto;

using ESRI.ArcGIS.ADF;
using ESRI.ArcGIS.esriSystem;
using ESRI.ArcGIS.Geometry;



namespace ArcMapAddin8
{
    public class Button1 : ESRI.ArcGIS.Desktop.AddIns.Button
    {
        public Button1()
        {
        }

        protected override void OnClick()
        {


            GetCommand(ArcMap.Application.Document as IMxDocument,);
            //
            //  TODO: Sample code showing how to access button host
            //
            ArcMap.Application.CurrentTool = null;
        }

       

#region "Get Command by Name"
public ICommandItem GetCommand(IApplication application, System.String commandName)
{
  ICommandBars commandBars = application.Document.CommandBars;
  ESRI.ArcGIS.esriSystem.UID commandID = new ESRI.ArcGIS.esriSystem.UIDClass();
  commandID.Value = "esriEditor.ReshapeFeatureTool";
  return commandBars.Find(commandID, false, false);
}
#endregion


        protected override void OnUpdate()
        {
            Enabled = ArcMap.Application != null;
        }
    }

}