Hello Martin,
I am sorry to hear you're experiencing such issues after upgrading to R1 2019 release.
The mentioned issues for RadDataGrid does not seem related to the behavior you've described in RadTreeView. So, I'd ask you if it is possible, to elaborate more on the exact setup you have regarding the TreeView. We'd need to reproduce it at our side in order to investigate it further.
I am looking forward to your reply.
Regards,
Yana
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