Hi Andrea,
I wasn't able to reproduce this issue with the latest internal build. Can you please have a look at the attached sample and let me know if it works for you or if I am missing something.
Also, do you apply a custom style to the Expander? If you do, can you please modify the solution to better illustrate your scenario and implementation so that we can further investigate it? Thank you in advance.
Kind regards,
Tina Stancheva
the Telerik team
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