My action steps are:

1.create a new query from schema browser
2.add a query web part and choose to display the content of the query defined at step 1
3.create a time chart by clicking "create time chart" menu in the query view
4.save the time chart

The question is that the saved time chart doesn't display under "chart" menu

So I digged the source code v14.1:

In QueryView.java of query module, time chart is not accepted.

        public boolean accept(String type, String label)
        {
            if (RReport.TYPE.equals(type)) return true;
            if (QueryReport.TYPE.equals(type)) return true;
            if (QuerySnapshotService.TYPE.equals(type)) return true;
            if (CrosstabReport.TYPE.equals(type)) return true;
            if (JavaScriptReport.TYPE.equals(type)) return true;
            if (GenericChartReport.TYPE.equals(type)) return true;
            return ChartQueryReport.TYPE.equals(type);
        }

But in StudyReportUIProvider.java of study module, time chart is accepted.

            public boolean accept(String reportType, String label)
            {
                if (StudyCrosstabReport.TYPE.equals(reportType)) return true;
                if (StudyChartQueryReport.TYPE.equals(reportType)) return true;
                if (ChartReportView.TYPE.equals(reportType)) return true;
                if (StudyRReport.TYPE.equals(reportType)) return true;
                if (ExternalReport.TYPE.equals(reportType)) return true;
                if (QuerySnapshotService.TYPE.equals(reportType)) return true;
                if (StudyQueryReport.TYPE.equals(reportType)) return true;
                if (TimeChartReport.TYPE.equals(reportType)) return true;
                if (JavaScriptReport.TYPE.equals(reportType)) return true;
                if (ParticipantReport.TYPE.equals(reportType)) return true;
                if (GenericChartReport.TYPE.equals(reportType)) return true;
                if (QueryReport.TYPE.equals(reportType)) return true;
                return false;
            }

Could you please tell me what is the difference for time chart handling in these two module?