Create a line plot (graph builder) with a partial shaded background

[#1]

I have a very nice x y plot in the graph builder and now would like to add a shaded area that envelopes  the data already plotted. The envelope is not a confidence area, rather a borderline.  Any suggestions ? 

Thank you 

Harald

[#2]

JMP allows for one to add graphics to any of the graphs and plots generated in JMP.  Here is an example taken from the Scripting Index

A complete set of graphic primitives' are available   Here is a listing taken from the Scripting Index

Here is the script that generated the above graph

Names Default To Here( 1 );
Open( "$SAMPLE_DATA/Big Class.jmp" );
biv = Bivariate( Y( :weight ), X( :height ), FitLine );
rbiv = biv << report;
framebox = rbiv[frame box( 1 )];
framebox <<
Add Graphics Script(
	Transparency( 0.5 );
	Fill Color( {1.0, 0.5, 0.0} );
	Polygon( [60, 72, 57], [75, 120, 120] );
);