How to call a function or process when checkbox is checked

[#1]

I have a Panel Box with multiple checkboxes in it. I want to be able to add additional checkboxes to the panel when one checkbox is selected.  For instance when I check CbBox2, I want the entire HLBox1 to be added to the window. Is this possible in JSL? See code below: 

HLBox1 = H List Box(
		spacer Box(Size(20,20)),
		CbBox3 = Check Box( "Additional Option Only to Appear if CbBox2 is selected." );
		CbBox3 << Set(0)
	);

GUIWindow1 = New Window("Preset Selections",
	PanelBox("Single option1, option 2, or Both",
	CbBox1 = Check Box( "Box 1 Option" ),
	CbBox2 = Check Box( "Box 2 Option" ),
	SpacerBox(Size(5,5)),
	
	CbBox1 << set( 1 ), 
	CbBox2 << set( 0 )
	),
	
);

[#2]

You can associate an anonymous function when you call Check Box() to create the display box.

GUIWindow1 = New Window("Preset Selections",
	PanelBox("Single option1, option 2, or Both",
	CbBox1 = Check Box( "Box 1 Option",
		<< Set Function(
			Function( { cb }, { temp },
				temp = cb << Get;
				// anything you need to do
			)
		)
	),
	CbBox2 = Check Box( "Box 2 Option" ),
	SpacerBox(Size(5,5)),
	
	CbBox1 << set( 1 ), 
	CbBox2 << set( 0 )
	)	
);

[#3]

Use the message

     << set items

There is a good example of this in the Scripting Index, under the entry for

     CheckBoxBox

Names Default To Here( 1 );
New Window( "Example",
	cb = Check Box(
		{"One", "Two", "Three"},
		Print( "Selected: " || Concat Items( cb << Get Selected(), ", " ) )
	)
);
Wait( 2 );
cb << Set Items( {"a", "Four", "Five", "Six"} );