Specifies
the widget class pointer for the created shell widget. ...Specifies the variable
argument list to override the resource defaults. 
The XtCreatePopupShell
  function ensures that the specified class is a subclass of Shell   and,
rather than using insert_child to attach the widget to the parent's  children
list, attaches the shell to the parent's pop-ups list directly. 
A spring-loaded
pop-up invoked from a translation table already must exist at the time that
the translation is invoked,  so the translation manager can find the shell
by name. Pop-ups invoked in other ways can be created ``on-the-fly'' when the pop-up
actually is needed. This delayed creation of the shell is particularly useful
when you pop up an unspecified number of pop-ups. You can look to see if
an appropriate unused shell (that is, not currently popped up) exists and
create a new shell if needed. 
XtCreateWidget(3Xt)
, XtPopdown(3Xt)
,
XtPopup(3Xt)
 
X Toolkit Intrinsics - C Language Interface 
Xlib - C Language X Interface 
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