A constituent chart is used to organize words (and perhaps eventally somehow morphemes) into a table where rows roughtly correspond to clauses and columns to key parts of a clause. A typical chart has two pre-nuclear columns, three or four nuclear ones (SVO and perhaps indirect object) and one or two post-nuclear ones. Currently the constituent chart is displayed as a tab in the interlinear window. It is created by reflection because it needs to refer to the interlinear assembly (in order to display words in interlinear mode), so the interlinear assembly can't know about this one.