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No way to set focus from I/O Usage table to Opened/Closed stacks.
I would propose to use Ctrl+[->] to access stacks from the table and Ctrl+[<-] to return to the table.
Fixed in http://hg.netbeans.org/cnd-main/rev/8c6390a5dbb9 Alt+Left switches to the left panel, and Alt+Right switches to the right panel.
Integrated into 'main-golden', will be available in build *200910160201* on http://bits.netbeans.org/dev/nightly/ (upload may still be in progress) Changeset: http://hg.netbeans.org/main-golden/rev/8c6390a5dbb9 User: Alexey Vladykin <alexey_vladykin@netbeans.org> Log: #174540 Can not access to Opened/Closed stacks in I/O Usage