Tab key works with CalendarExtender on sample site but not on production site

Hi,

I have some textboxes and calendarsextenders bound to them. When I click on 1st textbox, calendar pops up. It hides two other boxes beneath it. After I select date i need to go other text boxes. I tried with tab key but it does not switch to other control, and calendar remains open. I have to click on empty area of page to close calendar.

However, on test site provided with toolkit tab key works ok. Does anyone have idea what might be wrong?

Please reply with acomplete, simple, self-contained sample page that demonstrates the problem so that we can investigate the specific behavior you're seeing. Thank you!