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)
     .