Lines
This property allows you to specify the height of the Scroll-Bar control. If the PIXEL keyword follows the value specified here, the height is computed in pixels. If either the CELLS keyword or the Height-In-Cells style is specified, the height is computed in cells. In this case decimal values are allowed and the cell size is based on the font used for the parent window.
If the value of this property is not followed by any keyword and the Height-In-Cells style is not set, the Height-In-Cells style is assumed.
 
Example - Define a scroll-bar with height defined in lines
screen section.
...
  03 screen-1-sb-1 Scroll-Bar
     line 4.0
     column 41.5
     size 2.9 cells 
     lines 39.7 cells 
     color 229
     layout-data 16
     id 5
     .
...