By default, PLANT_AREA class in OpenPlant Modeler is a graphical root object which is mostly used in model server workflows. But user want to change this non-graphical root object and use it for 2D-3D integration purpose.
http://communities.bentley.com/products/plant/design___engineering/w/plant_design_and_engineering__wiki/12021.how-to-add-custom-associated-items-as-root-nodes-in-the-item-browser
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