Scala Swing Components

I have a collection of ComboBox declared as below.

val cmbAll = for (i <- 0 to 4) yield new ComboBox(List("---", "Single", "Double")) 

And I try to listen to one of it via

listenTo(cmbAll(0).selection) 

However, I can't actually perform the reactions.

reactions += { case SelectionChanged(`cmbAll(0)`) => /** action here **/ } 

All these are placed in a TabbedPane. I guess this is not the problem. So how can I listen to individual components inside of the collection?

Edited

This is a more complete code that I am trying in Eclipse.

import scala.swing._ import scala.swing.event._ object CMBTest extends SimpleSwingApplication { lazy val ui = new TabbedPane { import TabbedPane._ val cmbCategory = for (i <- 0 to 4) yield new ComboBox(List("---", "Single", "Double")) val cmbTab = new GridBagPanel { import GridBagPanel._ val c = new Constraints c.insets = new Insets(5, 5, 5, 5) for (i <- 0 to 4) { c.gridx = 0 c.gridy = i layout(cmbCategory(i)) = c } } pages += new Page("CMBTest", cmbTab) listenTo(cmbCategory(0)) reactions += { case SelectionChanged(`cmbCategory(0)`) => { println("This is cmbCategory(0) calling") } } } def top = new MainFrame { title = "ComboBox Array Test" contents = ui } } 

That error message that I am having is in the reactions part and it states that "not found: value cmbCategory(0)".