This ticket is based on the discussion from report Q315928 (ASPxTreeList - Tree lines do not show)
The Grid Lines and Tree Lines demo states:
Some themes (such as the 'DevExpress Style' or all 'Office 2010' themes) are engineered in such a way that by design, they are not intended to display tree lines and grid lines within the ASPxTreeList.
We should also include this note in the documentation.
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