UNMANAGE_WIDGET
  Removes the specified widget instance from the management of its parent.
  This causes the specified widget instance's parent to stop being
  responsible for determining the widget's space requirements.  It also
  stops the parent's determination of the widget's visibility, if the parent
  ever did determine visibility.
  Syntax
     UNMANAGE_WIDGET (widget [, widget...])
  Parameters
     widget               The widget instance you want to unmanage.
  Comments
     MANAGE_WIDGET performs the same functions as XtUnmanageWidget.
  Example
     The following statement unmanages the widget instance assigned to the
     variable "sample_x_keypad":
     MANAGE_WIDGET (sample_x_keypad);
  Related Topics
     CREATE_WIDGET    DELETE    GET_INFO(WIDGET_VARIABLE)
     MANAGE_WIDGET    MAP       REALIZE_WIDGET
     SET(MAPPED_WHEN_MANAGED)   UNMAP