XtMapWidget, XtSetMappedWhenManaged, XtUnmapWidget - map and unmap widgets
#include <X11/Intrinsic.h>
void XtMapWidget(Widget w);
void XtSetMappedWhenManaged(Widget w, Boolean
    map_when_managed);
void XtUnmapWidget(Widget w);
  - map_when_managed
- Specifies a Boolean value that indicates the new value of the
      map_when_managed field.
- w
- Specifies the widget.
If the widget is realized and managed and if the new value of map_when_managed
  is True, XtSetMappedWhenManaged maps the window. If the widget
  is realized and managed and if the new value of map_when_managed is
  False, it unmaps the window. XtSetMappedWhenManaged is a
  convenience function that is equivalent to (but slightly faster than) calling
  XtSetValues and setting the new value for the mappedWhenManaged
  resource. As an alternative to using XtSetMappedWhenManaged to control
  mapping, a client may set mapped_when_managed to False and use
  XtMapWidget and XtUnmapWidget explicitly.
XtManageChildren(3)
X Toolkit Intrinsics - C Language Interface
Xlib - C Language X Interface