XYGraph__EnableAnnotation (ul_pbar_graphics)

 *  Synopsis:
 *    #include <ul_pbar_graphics:xygraph.h>
 *
 *    TXYGraph__Result XYGraph__EnableAnnotation(
 *			EAnnotationOrientation theOrientation, int characters )
 *
 *  Function intent:
 *    XYGraph__EnableAnnotation() allows the user to request the creation of an
 *    "annotation" window to be added to the X-Y graph display.  The annotation
 *    window may be oriented horizontally accross the bottom of the graph
 *    display, or vertically along the right hand side of the graph display.
 *  Function parameters:
 *    EAnnotationOrientation	theOrientation	orientation request:
 *							kAnnotationHorizontal
 *							kAnnotationVertical
 *    int			characters	window width/height in characters
 *  Function return value:
 *    CBS_OK		success
 *    ~CBS_OK		XYGraph__DisplayGraph() already called...
 *			or XYGraph__EnableAnnotation() has already been called
 *    CBS_INVTYP	illegal orientation request
 *    CBS_INVSIZ	characters request to large to properly display
 *    else 		wn_xxx() function error occured