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Type: boolean
If set to true, the treecol will have indentation and twisties drawn to the left of it to indicate the hierarchy level of the rows. If no column has the primary attribute set to true, the tree may still contain nested rows, although no indication will be given to the user.  The attribute also controls whether the column picker allows the user to deselect this column.

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 Contributors to this page: SphinxKnight, Sheppy, pippijn, jonmmorgan, Marsf, Dria
 Last updated by: SphinxKnight,