Width-In-Cells
This style implies that the value specified for the 
Size property, the one setting the Tab-Control control’s width, is expressed in CELLS. It is possible to get the same result writing: "
Size value CELLS".
 
Example - Define a tab-control with width-in-cells style
screen section. ...   03 screen-1-tc-1 Tab-Control      line 2.8      column 25.7      size 34.6       lines 28.9       help-id 1036      id 10      width-in-cells      height-in-cells      .  |