XYGraph__PlotAnnotateText (ul_pbar_graphics)

 *  Synopsis:
 *    #include <ul_pbar_graphics:xygraph.h>
 *
 *    TXYGraph__Result XYGraph__PlotAnnotateText( int row, int col,
 *						  const char *text, int color )
 *
 *  Function intent:
 *    Write a text string to the plot window at a specified [row, col] in a
 *    specified color.
 *  Function parameters:
 *    int	row		row at which to display text
 *    int	col		column at which to display text
 *    char	*text		pointer to the text string to display
 *    int	color		color with which the text string is displayed
 *  Function return value:
 *    CBS_OK		success
 *    CBS_NOSETUP	XYGraph__DisplayGraph() has not been called
 *    else 		wn_xxx() function error occured