void elementChart_MouseDown(int Button, int Shift, int x, int y)
        {
            if (flag == 1)
            {
                Excel.Chart chart = Globals.ThisAddIn.Application.ActiveChart;

                //Int32 ;
                Int32 elementID = 0;
                Int32 arg1 = 0;
                Int32 arg2 = 0;

                chart.GetChartElement(x, y, ref elementID, ref arg1, ref arg2);

                //

                string element = ((Excel.XlChartItem)elementID).ToString();
                if (element == "xlSeries")
                {
                    Excel.SeriesCollection series = (Excel.SeriesCollection)chart.SeriesCollection();
                    Excel.Series Sseries = series.Item(arg1);
                    Sseries.Format.Fill.BackColor.RGB = System.Drawing.Color.FromArgb(SelectRGB[2], SelectRGB[1], SelectRGB[0]).ToArgb();
                    Sseries.Format.Fill.ForeColor.RGB = System.Drawing.Color.FromArgb(SelectRGB[2], SelectRGB[1], SelectRGB[0]).ToArgb();
                    flag = 0;
                }
            }

            // MessageBox.Show("Chart element is: " + ((Excel.XlChartItem)elementID).ToString()
            //    + "\n arg1 is: " + arg1.ToString() + "\n arg2 is: " + arg2.ToString());

        }