public override bool ConvertChildClientPoint(ref System.Drawing.Point clientPointWinForms, out string childUIObject)
        {
            childUIObject = string.Empty;
            var clientPoint = new Point(clientPointWinForms.X, clientPointWinForms.Y);

            //指定座標の要素取得
            var hitElement = PointUtility.GetPosElement(clientPoint, _control);

            if (hitElement == null)
            {
                return(false);
            }

            //DataGridCell取得
            DataGridCell cell = null;

            foreach (var x in TreeUtilityInTarget.VisualTree(hitElement, TreeRunDirection.Ancestors))
            {
                if (Equals(x, _control))
                {
                    break;
                }
                cell = x as DataGridCell;
                if (cell != null)
                {
                    break;
                }
            }

            if (cell == null)
            {
                return(false);
            }
            var row = DataGridRow.GetRowContainingElement(cell);

            if (row == null)
            {
                return(false);
            }

            int rowindex = row.GetIndex();
            var colIndex = cell.Column.DisplayIndex;

            //座標変換
            var screenPos  = _control.PointToScreen(clientPoint);
            var childPoint = cell.PointFromScreen(screenPos);

            clientPointWinForms.X = (int)childPoint.X;
            clientPointWinForms.Y = (int)childPoint.Y;

            childUIObject = $".GetCell({rowindex}, {colIndex})";
            return(true);
        }