Group Tree issue when refreshing- Crystal for Visual Studio 2010 WPF Viewer

We've run into an issue when refreshing reports with the WPF viewer for Visual Studio 2010. After the report is refreshed, the Group Tree is blank and it should have values. For example, you run a report and see values in the Group Tree. If you refresh the report with the same parameter values the Group Tree is blank.
Has anyone run into this yet?

That is correct.
I just did a quick test and was not able to reproduce the issue.
Details of test:
1) Create a new app;
File | New | Project
Visual Basic | reporting -> Crystal Reports WPF Application
2) Add the "Open File" button to the viewer (ShowOpenFileButton off of the WPF viewer properties)
3) Run app
4) Browse to a report that has a number of groups >250
5) Refresh report using the Refresh button on the viewer
I'll work on this a bit later today, see if I can repro it another way. Meanwhile, can you provide mode details (code) on how you repro the issue?
- Ludek

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