Inline AJAX CalendarExtender corrupts subsequent layout

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With Visual Studio 2008 ASP.NET, I am using an inline AJAX CalendarExtende r,
followed by an inline AJAX DropDownExtende r that extends a label contol.
After selecting a date via the calendar dropdown, the position of the
subsequent DropDownExtende r's DropDownControl changes from the bottom right
to the
Middle left. (The DropDownControl appears directly left of the
TargetControl, rather than beneath the TargetControl.) How do I ensure the
DropDownControl appears below the TargetControl?

Thank you for your assistance.