Width-In-Cells
This style implies that the value specified for the Size property, the one setting the Bar control’s width, is expressed in CELLS. It is possible to get the same result writing: "Size value CELLS".
 
Example - Define an horizontal bar on screen section with size 46.0 expressed in cells
screen section.
...
  03 screen-1-br-2 Bar
     line 5.0
     column 12.0
     size 46.0
     id 2
     width-in-cells
     .