MOSS: Unable to view the stack trace in Central Administration

Problem:
Unable to view full stack trace in Central Admin site.

Web.config of central admin site has

<safemode maxcontrols="50" callstack="true">

and

<customerrors mode="Off">

Solution:
You must set AllowPageLevelTrace to true as well like this:

<safemode maxcontrols="50" callstack="true" AllowPageLevelTrace="true" />