New Window() and Column Dialog() enable you to construct a launch window that has a column selector. Use Column Dialog() to construct a simple launch window. Several items are added automatically to column dialogs: the Remove and Cancel buttons, the list of columns, and an OK button (if no buttons are explicitly defined).
dt = Open( "$SAMPLE_DATA/Big Class.jmp" );
dlg = Column Dialog(
	x = ColList( "X" ),
	y = ColList( "Y" )
);
New Window() is more flexible because of numerous optional arguments. In the following example, the user must select two columns before clicking the OK button. A Bivariate graph is then created. Validating the user’s selections is not possible in Column Dialog().
dt = Open( "$SAMPLE_DATA/Big Class.jmp" );
xvar = .;
yvar = .;
win = New Window( "Example of Returning Values",
	<<Modal,
	<<On Validate(
	// require the user to select two variables before clicking OK
		Show( xvar, yvar );
			If( Is Missing( xvar ) | Is Missing( yvar ),
			// if xvar or yvar are missing do nothing when OK is clicked
			0,
			1
		);
	),
	Text Box( " Select two numeric columns. " ),
	H List Box(
		Text Box( " X, Factor " ),
		x = Col List Box(
			dt, // data table reference
			all, // display all columns from the data table
			xvar = (x << Get Selected)[1];
			// get the name of the selected column before the window closes
			Show( xvar );
		),
		Text Box( "Y, Response" ),
		y = Col List Box(
			dt,
			all,
			yvar = (y << Get Selected)[1];
			Show( yvar );
		)
	)
);
If (win["Button"] == 1, // if the user clicks OK...
xcol = Column( dt, xvar ); //  get the columns
ycol = Column( dt, yvar );
dt << Bivariate( Y( ycol ), X( xcol ) ); // create a Bivariate plot
);

Help created on 9/19/2017