Height-In-Cells
This style implies that the value specified for the Lines property, the one setting the Tree-View control’s height, is expressed in CELLS. It is possible to get the same result writing: "Lines value CELLS".
 
Example - Define a tree-view with height in cells
screen section.
...
  03 screen-1-tv-1 Tree-View
     line 2.7
     column 3.4
     size 20.8 cells 
     lines 29.1
     height-in-cells
     color 144
     id 2
     .