Hi Vitali,
Thank you for writing.
In regards to your first question, you can use the following code snippet to change the images avoiding the described issue:
As to your seond question, you can add a RadImageItem to the RadRotator Items collection, so you do not need to add picture boxes.
I hope this will help. If you have further questions, I would be glad to help.
Regards,
Ivan Petrov
the Telerik team
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