Error when using Try() on Collistbox()

[#1]

Basically I'm building a custom interactive window which includes different display boxes and I'm trying to simplify the selection input with a for loop. For instance, I have both a combobox & a collistbox and I'm trying to get input for both using a loop statement. But when I did this, I got an error instead. Am I writing the expression incorrectly ? (error log attached)

Names Default To Here( 1 );
dt = Open( "$SAMPLE_DATA/Big Class.jmp" );
New Window( "Col List Box Example",
	vlistbox(
		var1 = combobox({"one", "two", "three"}),
		hlistbox(Col List Box( all, width( 250 ), maxSelected( 1 ) ),
			var2 = Col List Box()	
		)	
	)
);

var2 << append("height");

AA = {"",""};

for(i=1,i<=2,i++,
	temp1 = "var"||char(i);
	eval(
		substitute(
			expr(try(AA[i] = expr.temp1 << get, AA[i] = expr.temp1 << get items)), //try to use get, if error, use get items
			expr(expr.temp1),parse(temp1)
		)
	)
);

show(AA);

[#2 · Accepted solution]

I think your Try doesn't work because << Get doesn't rise an error when used with ListBoxBox (just a message to log). If you want to get values this way, you could for example use << Class Name:

Names Default To Here(1);

dt = Open("$SAMPLE_DATA/Big Class.jmp");
New Window("Col List Box Example",
	V List Box(
		var1 = Combo Box({"one", "two", "three"}),
		H List Box(Col List Box(all, width(250), maxSelected(1)), var2 = Col List Box())
	)
);

var2 << append("height");

AA = {"", ""};
For(i = 1, i <= 2, i++,
	temp1 = "var" || Char(i);
	Eval(
		Substitute(
				Expr(
					If(expr.temp1 << class name == "ComboBox",
						AA[i] = expr.temp1 << get
					,
						AA[i] = expr.temp1 << get items					
					)
				), //try to use get, if error, use get items
			Expr(expr.temp1), Parse(temp1)
		)
	);
);

Show(AA); //AA = {1, {"height"}};

I would usually suggest not getting the values like this and try to figure some other way than dynamically creating variable names (storing references to list or associative array for example).