Column-Headings
When this style is set, a heading is shown at the top of the Tree-View area. The content of the column headings cannot be changed by the user. Column headings may have a different color (see the Heading-Background-Color, Heading-Color and Heading-Foreground-Color properties), a different font (see the Heading-Font property) and are not scrolled.
This style has effect only in conjunction with the 
Table-View style. 
 
Example - Define a tree table view with 3 columns and column headings:
... screen section. ...   03 screen-1-tv-1 Tree-View      line 2.7      column 3.4      size 20.8 cells       lines 29.1 cells       height-in-cells      color 144      id 2      table-view      column-headings      tiled-headings      cenered-headings      display-columns (1, 10, 15)      .  |