How to set the value in a NumberColEditBox from JSL?

[#1]

I made a Ternairy plot, like the one in JMP  via Help > Help tool click on ternairy plot, "Additional Examples of the Ternary Plot Platform" > "Example of a Ternary Plot with a Contour Function". This example has a NumberColEditBox for Temperature. My situation is comparable. In this box I want to change the value from within a JSL script and not by using the slider, but I cannot find out how to do that. Please help! I am using JMP 18.

[#2]

Here is a simple example

names default to here(1);
dt=
// Open Data Table: Fish Patty.jmp
// → Data Table( "Fish Patty" )
Open( "$SAMPLE_DATA/Fish Patty.jmp" );

Ternary Plot(
	X( :Mullet, :Sheepshead, :Croaker ),
	Contour Formula( :Predicted Rating )
);

current report()[NumberColEditBox(2)]<<set({55});

To get the path to the NumberColEditBox, right click on the graph and select Show Properties, then click on the NumberColEditBox and look at the Box Path