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(this may be an openide/explorer issue) The original spec ( http://ui.netbeans.org/docs/hi/debugger3.4/tables/index.html ) is ambiguous about this, but I think the intent was that all the sortable columns should appear in the Sort By submenu of the List Options menu. At the moment, only the ones currently showing are listed.
The document says "The contents of list is always sorted by the contents of one column. This column does not necessarily need to be visible.". Right now you cannot choose an invisible column to be the sort key. I think the problem lies somewhere within the Explorer code.
I think it is some component from explorer package. Debugger should know more what component is used here.
*** This issue has been marked as a duplicate of 24893 ***
verifing duplicity