gridView 编辑单元格获取单元格焦点位置（位于单元格的焦点位置）

        private void Form1_Load(object sender, EventArgs e)
        {
            DataTable dt = new DataTable();
            dt.Columns.Add("A");
            dt.Columns.Add("B");
            for (int i = 0; i < 20; i++)
            {
                dt.Rows.Add(i + 1, "测试数据0000" + i);
            }
            gridControl1.DataSource = dt;
            
        }
        private void txt_MouseUp(object sender, MouseEventArgs e)
        {
            TextEdit txt = gridView1.ActiveEditor as TextEdit;
            int a = txt.SelectionStart;
            MessageBox.Show("鼠标当前坐标"+a);
        }