How do I use x-axis label instead of a legend in graph builder box plot?

[#1]

   I would like to have a script that automatically plots several box plots together in jmp.  I am able to come close to what I need, but I don't want to use the legend.  I would like to use the x-axis to label instead.  Below is what I have been able to achieve.  All I need to change is to remove the legend(that's easy) and put the "Col1", "Col2", and Col3" label on the x-axis (can't figure this part out). 

The motivation for this change is that I often have a larger number of columns to plot and can't tell which column is which from the color in the legend.  The solution will eventually need to be in JSL, but if I can get it to work manually, it should be simple to extract the script and do it in JSL.

[#2]

Double click on the legend, then edit the legend names.

The JSL will look like this

Graph Builder(
	Size( 527, 418 ),
	Show Control Panel( 0 ),
	Variables( Y( :Col 1 ), Y( :Col 2, Position( 1 ) ), Y( :Col 3, Position( 1 ) ) ),
	Elements( Box Plot( Y( 1 ), Y( 2 ), Y( 3 ), Legend( 3 ) ) ),
	SendToReport(
		Dispatch(
			{},
			"400",
			ScaleBox,
			{Legend Model(
				3,
				Level Name( 0, "my name1", Item ID( "Col 1", 1 ) ),
				Level Name( 1, "my name 2", Item ID( "Col 2", 1 ) ),
				Level Name( 2, "my name 3", Item ID( "Col 3", 1 ) )
			)}
		)
	)
)

[#3]

Ignore the last post, I misread your request.

[#4 · Accepted solution]

The easiest method is to stack your columns first. Then use Data for Y and label for X.  

The original plot you created all the points are plotted at zero and the boxplots are offset from the points. There is an X-axis but the range is like -0.5 to 0.5.  You could create some custom labeling to emulate an x-axis but positioning etc, will take a bit of scripting. 

By using the stacked columns the points and box plots are aligned, etc.