There is a problem with grouping of columns. I have put a small sample project. On 1.10.1007 all works normally. This problem has started to arise on service release 10.1.2027.
I have put screenshots.
I have got the same problem...
the Bug disappear's after the DataSource gets applied a second time when the Grid is already shown.
That's a CRITICAL BUG for us because lot's of Customer's are using this Function!
This is a known bug and it will be corrected in the next service release, which is scheduled to go out at the beginning of July.
Infragistics Service Releases
No, there is no workaround.
Do you have an Workaround?