Allows customization of the popup menus of TableView and OutlineView.
Just create a subclass of this class and override method createPopupMenu
(and call setNodePopupFactory() on TableView or OutlineView).
Creates a popup menu with entries from the selected nodes
related to the given component (usually a ETable subclass). The popup
is created for the table element in given column and row (column
and row are in the view's coordinates (not the model's)).