isCOBOL Evolve : User Interface : Controls Reference : SLIDER : Properties : Visible
Visible
This property assumes a value of "0" if the Slider control is not visible, "1" if it is visible.
 
Example - Define a slide-bar initially invisible and make it visible on procedure division
screen section.
...
  03 screen-1-sl-2 Slider
     line 39.1
     column 12.8
     size 38.4 cells 
     lines 3.8 cells 
     id 10
     horizontal
     show-labels
     min-val 10
     max-val 100
     page-size 5
     labels-increment 15
     visible 0
     .
...
procedure division.
...
   modify screen-1-sl-2 visible 1
...