Border-Width
This property allows you to set or retrieve the width of the four borders of the Push-Button control. The property is a list of four values that specify the width in pixels of the top, left, bottom and right border respectively. This property has effect only on buttons with the 
Flat style.
Setting the property to -1 resets the borders.
Passing less than four values assumes that the remaining values are 0.
 
Example - Define a push-button control with a huge bottom border
screen section. ...   03 screen-1-pb-1 Push-Button      line 4.5      column 8.1      size 70      lines 48      id 1      flat      border-width (1 1 5 1)      bitmap-handle icon-png      square      bitmap-default 21      bitmap-disabled 18      bitmap-rollover 19      bitmap-pressed 20      bitmap-width 18      .  |