XtManageChildren()														XtManageChildren()

Name
  XtManageChildren - bring an array of widgets under their parent's geometry management.

Synopsis
     void XtManageChildren(children, num_children)
	 WidgetList children;
	 Cardinal num_children;

Inputs
  children    Specifies an array of child widgets.  The widgets must all be siblings and must be of class RectObj or any subclass thereof.

  num_children
	      Specifies the number of children in the array.

Description
  XtManageChildren()  brings  a  list  of  widgets  created with XtCreateWidget() under the geometry management of their parent.  All widgets
  (except shell widgets) must be managed  in  order  to  be  visible.	Managing  a  widget  will  generally  make  it	visible,  unless  its
  XtNmappedWhenManaged resource is False.

  The "Algorithm" section below details the procedure followed by XtManageChildren().

Usage
  To manage a single widget, you can use XtManageChild().  To unmanage widgets, use XtUnmanageChild() and XtUnmanageChildren().

  If  you  are going to manage multiple children of the same managed and realized parent, it is more efficient to place those children widget
  into an array and call XtManageChildren() just once than it is to manage them individually.  The former technique results in only a  single
  call to the parent's change_managed() method.  If you are creating widgets before the widget tree has been realized, however, managing them
  one at a time is fine.

Algorithm
  XtManageChildren() performs the following:

  o  Issues an error if the children do not all have the same parent or if the parent is not a subclass of compositeWidgetClass.

  o  Returns immediately if the common parent is being destroyed; otherwise, for each unique child on the  list,  XtManageChildren()  ignores
     the child if it already is managed or is being destroyed, and marks it otherwise.

  o  If the parent is realized XtManageChildren() does the following:

     -	Calls the change_managed() method of the widgets' parent.

     -	Calls XtRealizeWidget() on each marked child that is unrealized.

     -	Maps each marked child that has its XtNmappedWhenManaged resource True.

  The  management of children is independent of the creation and ordering of the children.  There is no special list of managed children; the
  layout routine of the parent should loop through the list of all children and simply ignore those that are not managed (see XtIsManaged()).

Structures
     typedef Widget *WidgetList;

See Also
  XtCreateManagedWidget(1),  XtIsManaged(1),  XtManageChild(1),  XtMoveWidget(1),  XtRealizeWidget(1),	XtSetMappedWhenManaged(1),   XtUnman-
  ageChild(1), XtUnmanageChildren(1).

Xt - Widget Lifecycle														XtManageChildren()