We've just committed a fix to SVN that deals with the setStartCollapsed issue, as well as several other expand/collapse state tracking issues in the grouping gridview. This will be available tonight in the nightly build, and we'll be testing it further as well.
Barring any unforeseen problems, this will be available in the next release.
I am hoping that this is part of the same issue - we have two screens that utilise a GroupSummaryView and I we are able to group by the columns ok. However, once the grouping is done we are not able to collapse the groups. Clicking on the small - (minus) icon has no discernible affect whatsoever. Can you confirm if this is part of the same issue or perhaps part of another known bug that is being addressed ?
We've found and fixed another minor related issue, so I'm closing this as fixed, and will be available in the next release.
aspadev: Can you provide a code sample that demonstrates the issue? It doesn't quite sound like this issue from your description. Without more information, I'd guess that your ModelKeyProvider is not returning unique values for each row - that can cause similar sounding selection model issues.