Hello Ruth Goldberg,
Thank you for writing. I have not managed to reproduce the described issue. I have tried a similar scenario and the tab order works as expected. Please, take a look at the attached sample project. However, the weird behavior could be caused by something specific to your application. Please, send me more details on it, or a small sample project that demonstrates it. This will help me to investigate the problem further and provide accurate assistance. I look forward to your reply.
the Telerik team