在Silverlight中如何获得FlexGrid鼠标所在行列值

private void _flex_MouseMove(object sender, System.Windows.Input.MouseEventArgs e)
        {
            int row, col;
            double rowHeight, colWidth;

            row = -1;
            col = -1;
            rowHeight = 0;
            colWidth = 0;

            Point p = e.GetPosition(_flex);

            for (int r = 0; r < _flex.Rows.Count; r++)
            {
                rowHeight += _flex.Rows[r].ActualHeight;
                if (p.Y < rowHeight)
                {
                    row = r;
                    break;
                }
            }

            colWidth = _flex.RowHeaders.DesiredSize.Width;
            for (int c = 0; c < _flex.Rows.Count; c++)
            {
                colWidth += _flex.Columns[c].ActualWidth;
                if (p.X < colWidth)
                {
                    col = c;
                    break;
                }
            }

            this.label1.Content = string.Format("({0},{1})", row, col);
        }
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