Mixin question

Hello!

I try to do something like this:

new MyFrame with BlueTheme

abstract class MyFrame extends JFrame with Theme {
    println(aColor)
    ...
    setVisible(true)
}

trait Theme { def aColor:Color }

trait BlueTheme extends Theme { def aColor = Color.BLUE }

That works when I use defs. If I use vals instead in Theme and BlueTheme (or only in BlueTheme) it prints null. OK, I kind of understand this, it's obviously some initialization order issue. What I don't understand is why even this doesn't work:

trait BlueTheme extends Theme { private val blue = Color.BLUE; def aColor = blue }

I just don't grok it :-/

Could you please enlight me? I have the feeling I'm doing something stupid...

Merry Christmas!
Daniel
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