@Override
            public void onValueSelected(int columnIndex, int subcolumnIndex, SubcolumnValue value) {
                generateLineData(value.getColor(), 100);
            }
Generates initial data for line chart. At the begining all Y values are equals 0. That will change when user
will select value on column chart.
hellocharts-samples/src/lecho/lib/hellocharts/samples/LineColumnDependencyActivity.java