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A subarea<%> is a containee area<%>.
All subarea<%> classes accept the following named
 instantiation arguments:
- horiz-margin — - default is 2 for control<%> classes and group-box-panel%, 0 for others; passed to horiz-margin 
- vert-margin — - default is 2 for control<%> classes and group-box-panel%, 0 for others; passed to vert-margin 
method
(send a-subarea horiz-margin) → spacing-integer?
(send a-subarea horiz-margin margin) → void? margin : spacing-integer? 
Gets or sets the area’s horizontal margin, which is added both to the
 right and left, for geometry management. See Geometry Management for more
 information.
method
(send a-subarea vert-margin) → spacing-integer?
(send a-subarea vert-margin margin) → void? margin : spacing-integer? 
Gets or sets the area’s vertical margin, which is added both to the
 top and bottom, for geometry management. See Geometry Management for more
 information.