Problem with On Close() statement in New Window

[#1]

I have a script that takes in a table, produces two summary tables dtMean and dtStdDev, and then draws some tabulates and opens then in a new window like so:

vlb = V List Box(
dtMean << Tabulate(
...),
dtStdDev << Tabulate (
...)
);
closeTables = Expr(
	Close( dtMean, NoSave );
	Close( dtStdDev, NoSave );
	
);

nw = New Window( "Tool to tool matching",
	Show Menu( 0 ),
	Show Toolbars( 0 ),  On Close(closeTables), vlb
);

this On Close statement causes error:

Name Unresolved: On Close in access or evaluation of 'On Close' , On Close( closeTables ) /*###*/

[OK]

But if I run closeTable separately - tables close.

Why and how to fix?

[#2]

Nevermind, it needs to be

<< On Close()

not 

On Close()