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    Type:New Feature 
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    Resolution: Done
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    Priority:Normal 
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    Affects Version/s: 8.6.2
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    Component/s: Components
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    Security Level: Jimmy
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        None
tree/model have dedicated methods to select all
Tree.selectAll  and AbstractTreeModel.DefaultSelectionControl.setAllSelected
the next step would be to implement a "select all" checkbox similar to listbox in the column headers.
