JSL to Set Graph Y axis Max Value based on Cell Value

[#1]

I am plotting graph and add refence line. I would like the reference line and Y max axis value can be seen on the graph. I am trying to set the Y axis max value based on the max cell value. 

 I do not see the Y max appear in the graph.

Below is my script. Can anyone advise what wrong with the script?

dt= Current Data Table();

MX = Max(:Weight);
If(
	MX < 80, 
	    MX = 90; 
	    MX = MX + 10
);

dt << Overlay Plot(
	X( :WW ),
	Y( :Weight ),
	Y Axis[1] << {{Max( MX ), Minor Ticks( 1 ),
	Add Ref Line( 80, "Solid", "Red", "", 1 )}},
	Separate Axes( 1 ),
	Connect Thru Missing( 1 ),
	
		Dispatch(
			{},
			"106",
			ScaleBox,
			{Max( MX ), Minor Ticks( 1 ),
			Add Ref Line( 80, "Solid", "Red", "", 1 )}
		),
		Dispatch(
			{},
			"101",
			ScaleBox,
			{Min(0), Max( 11 ), Inc( 1 ), Minor Ticks( 1 )}
		)
	
);

[#2 · Accepted solution]

The Overlay plot has been depreciated.  One should be using the Graph Builder for this type of graphic.

Here is the script for the graph above

dt= Current Data Table();

MX = col Max(:Weight);
If(
	MX < 80, 
	    MX = 90,
	    MX = MX + 10
);

gb = dt <<Graph Builder(
	Size( 534, 456 ),
	Show Control Panel( 0 ),
	Variables( X( :WW ), Y( :Weight ) ),
	Elements( Line( X, Y, Legend( 16 ) ), Points( X, Y, Legend( 17 ) ) )
);
report(gb)[AxisBox(2)] << max(MX) << add ref line( 80, "Solid", "Red", "", 1 );
report(gb)[AxisBox(1)] << min(0) << max(11) << incr(1);

[#3]

Thanks Jim.