     titlePadding: { left: 90, top: 0, right: 0, bottom: 10 },
                source: sampleData,
                xAxis:
                    {
                        dataField: 'Index',
                        tickMarks: {
                            visible: true,
                            interval: 1
                        },
                        gridLines: {
                            visible: true,
                            interval: 1
                        }
                  