border in area-container<%>
Gets or sets the border margin for the container in pixels. This margin is used as an inset into the panel's client area before the locations and sizes of the subareas are computed.
( -> exact integer in [0, 1000]send an-area-container border)
Returns the current border margin.
( -> void
send an-area-container border margin)
margin : exact integer in [0, 1000]
Sets the border margin.