Hi Daniel,
I am afraid that I was not able to reproduce the issue. I set up a form with a RadTreeView and a RadButton. In the NodeCheckedChanged event I call RadButton.Focus() to remove the focus from the tree view and everything works as expected. Please provide more details on your application or submit a support ticket with a sample application which demonstrates the issue.
You can submit a support ticket by logging in with your account and navigating to
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support tickets. I am looking forward to your reply.
Greetings,
Victor
the Telerik team