Font :
======

   Labels  have different default fonts, fixed by resources, 
 according to types (struct, behav, logic, hook) and type of labeled
 object (box, port, vertex ...). For example:

       atg*behavLabelBoxFont :          *-helvetica-bold-r-normal--12-*
       atg*structLabelBoxFont:          *-helvetica-bold-r-normal--12-*
       atg*logicLabelBoxFont :          *-helvetica-bold-r-normal--12-*
       atg*hookLabelBoxFont  :          *-helvetica-bold-r-normal--12-*

   Postscript fonts must also be similarly provided:

       atg*behavLabelBoxPostscriptFont : Helvetica-Bold 12
       atg*structLabelBoxPostscriptFont: Helvetica-Bold 12
       atg*logicLabelBoxPostscriptFont : Helvetica-Bold 12
       atg*hookLabelBoxPostscriptFont  : Helvetica-Bold 12

   Individual objects or selctions can also be changed label fonts through
 the <Attributes>:<Font>  menu. This menu content is again fixed by
 resources, including the number of fonts declared, and cannot be dynamically
 changed in atg.

   The <Font>:<Default> button resets the original font on the label.