new (JSONTreeView)

         # File lib/json/editor.rb, line 701
    701:       def initialize(window)
    702:         @window = window
    703:         super(TreeStore.new(Gdk::Pixbuf, String, String))
    704:         self.selection.mode = SELECTION_BROWSE
    705:
    706:         @expanded = false
    707:         self.headers_visible = false
    708:         add_columns
    709:         add_popup_menu
    710:       end