Hi,
I run into the problem with loadonce=true and grouping.
Based on Oleg code I tried to implement similar solution.
But when groupCollapse(options) is called after triggering 'reloadGrid' options.group is invalid.
Code demonstrating problem is here Fiddle.
When button is press all records has options.group set to last group.

Has anyone had similar problem?

Greetins
Arek