My Button1 is inside a Panel, I want to access the rowindex so that I will hide that Imagebutton. But when I enter debug mode, the GridView1.SelectedIndex has a null value. pleaase help!

```
  protected void Button1_Click1(object sender, EventArgs e)
    {

        foreach (GridViewRow row in GridView1.Rows)
        {
            if (row.RowType == DataControlRowType.DataRow)
            {
                if (row.RowIndex == Convert.ToInt32(GridView1.SelectedIndex))
                {
                    ImageButton StopButton = (ImageButton)row.FindControl("stopImageButton");
                    ImageButton StartButton = (ImageButton)row.FindControl("startImageButton");
                    StopButton.Visible = true;
                    StartButton.Visible = false;          
                }
            }
        }

        this.StopTimeNotesPanel_ModalPopupExtender.Hide();
    }

```