Hi Jai,
thank you for pointing out a direction. I have to see how I can make use of this because I do modifiy SelectedItems within my handler and this could lead to an infinite recursion so I could either disable/reenable the nofitication while processing it or I have to rewrite my code.
The reason I am modifing SelectedItems is because I want to support selection of groups (both collapsed and expanded) with automatically including all contained subgroups or items.
However, you can consider this issue as resolved.
Regards
Bernd