DataGridView:当多选为真时,如何选择当前行中的第一个单元格

我想创建一个方法来选择当前行中的第一个单元格,所以我写了这个:

        /// <summary>
    /// The method selects first visible cell in a current row.
    /// If current row is null, nothing is done. 
    /// If any cells are selected, they are unselected before selecting first cell.
    /// </summary>
    public void SelectFirstCellInCurrentRow()
    {
        if (CurrentRow == null) return;

        ClearSelection();
        foreach (DataGridViewCell cell in CurrentRow.Cells)
        {
            if (cell.Visible)
            {
                cell.Selected = true;
                return;
            }
        }
    }

我想这样使用它,例如:

     private void btnAdd_Click(object sender, EventArgs e)
        {
            bindingSource.Add(new Customer());
            bindingSource.MoveLast();
            grid.SelectFirstCellInCurrentRow();
            grid.BeginEdit(false);
        }

它看起来是这样的:

2) 按下添加按钮后:
_http://img211.imageshack.us/img211/847/afteradd.gif

PS.为什么我不能添加图片?