For MS: Indeed I think ReportViewer Control should be an open source component as we as developer needs the flexibility to customize the report viewer interface as well as can learn directly from the control source so to understand how can we integrate better with SSRS.
The RSExplorer sample distributed with the SQL Server 2005 Samples (installed by default in C:\Program Files\Microsoft SQL Server\90\Samples\Reporting Services\Application Samples\RSExplorer Sample) will probably help. Interactive sort uses the ReportExecutionService.Sort API. However, I don't think you will get too far trying to implement interactive sorting on your own since the Sort API takes the id of the item to be sorted but you have no way to know it in advance.
I agree with you that some RS areas are good candidates for open source, including the Report Viewer controls, Report Manager, and SharePoint web parts and I hope that a future release will help in this area. Meanwhile, you can use the .NET Reflector to understand how the Report Viewer control works.
|||The reflector is quite a useful guidance, I am very new on the reflector thing though, will try to see how it works. RSExplorer seems not the right project, there is no sign of using ReportExecutionService at all, it just does the report publishing using ReportService and use URL based browsing to run the report.We could just hope MS to release these sources for us, but most people are quite negative in this expectation- including myself.
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