#24 Prevent groups to automatically collapse

[Herledant]

Hello Philip,
First of all, congratulation for this wonderful library! It's a great and very usefull job.

I found how to add group with the ObjectListView_AboutToCreateGroups event and i make them collapse at the creation.
however when I click to uncollapse a group and then click on a header to sort, the group collapse again.
How to prevent this behavior?

Regards

Fabien