Fill-Char
This property is used to specify what character is used to fill the empty places of an entry-field formatted with the Format-String property.
 
Example - Define an entry-field control with a fill char of underscores and a format-string
screen section.
...
  03 screen-1-ef-2 Entry-Field
     line 29.0
     column 49.5
     size 13.1 cells 
     lines 4.6 cells 
     id 19
     3-d
     fill-char "_"
     format-string "###-?????-###"
     .