Stop Code When Cancel Button Pressed

[#1]

I have some code that allows users to pick several options. If they press OK then the code runs as expected but I can't get the cancel button to cancel the code. Exiting the window also results in the code being run. I would like the user to be able to cancel or exit the window and have that stop the code.

win = New Window( "Customise Analysis",
	<<Modal,
	<<Return Result,
	<<On Validate(x = cb<<Get();
		If( ...
		);
	),
	Text Box("Choose the product"),
	cb = Combo Box(
		{"..."},
	),
	Text Box( "..." ),
	fail_out = Number Edit Box( 100 ),
	Text Box("..."),
	Text Box("..."),
	point_lim = Number Edit Box(2),
	Button Box("OK"),
	Button Box("Cancel"),
);

[#2 · Accepted solution]

One option would be to use the button value returned from the window:

Names Default To Here(1);
nw = New Window("Dialog() example",
	<<Modal,
	<<Return Result,
	V List Box(
		H List Box("Set this value", variable = Number Edit Box(42)),
		H List Box(Button Box("OK"), Button Box("Cancel"))
	)
);

If(nw["Button"] != 1,
	stop();
);
show("continue");