This Bugzilla instance is a read-only archive of historic NetBeans bug reports. To report a bug in NetBeans please follow the project's instructions for reporting issues.
The spec at http://ui.netbeans.org/docs/hi/debugger3.4/threads/index.html says that there should be a method and line column in the thread list. This is related to the properties associated with a thread. An alternate approach, though, would be to combine the class and method columns and properties (thereby being consistent with the stack) and calling it just "method", or perhaps "routine" so it is language neutral.
The UI spec should be followed.