You could get the references to Axisboxes with XPath. The XPath I use here is most likely not robust enough and should be improved
Names Default To Here(1);
dt = Open("$SAMPLE_DATA/Big Class.jmp");
nw = New Window("",
	H List Box(
		Button Box("Scale axis   ",
			Try(fsl = fg << report;
				axisboxes = fsl << XPath("//AxisBox");
				axisboxes[1::N Items(axisboxes) - 1::3] << Min(20) << Max(100);				
			);
		),
		V List Box(
			fg = Fit Group(
				Oneway(Y(:height), X(:name)),
				Oneway(Y(:height), X(:age)),
				Oneway(Y(:height), X(:sex)),
				<<{Arrange in Rows(1)}
			);
		)
	)
);
Or you can get references to outline boxes and then loop the AxisBox(1)
ows = fg << XPath("//OutlineBox[contains(text(), 'Oneway Analysis of')]");
For Each({ow}, ows,
	ow[AxisBox(1)] <<Min(10) << Max(150);
);
					
				
			
			
				
	-Jarmo