How to change the Label text and update the window?

#!/usr/bin/env fan

using fwt

class ChangeLabelText
{
  Label l := Label { text = "hello world" }
  Window w := Window { l }

  Void main() {
    w.open

    // Now I want to change the Label text, but this doesn't work:
    l.text = "foobar"
    w.repaint
  }
}

Using Text instead of Label didn't work either. Any help please?

Its actually working - but w.open is blocking the main thread - so that code doesn't get executed till after you close the window. If you modify the label on the event thread, it should work - as in the example code below:

using fwt
class ChangeLabelText
{
  Label l  := Label { text = "hello world" }
  Button b := Button 
  {
    text = "Click me!"
    onAction.add |,| { l.text = "foobar" }
  }
  Window w := Window
  {
    l
    b
  }
  Void main() { w.open }
}

but w.open is blocking the main thread

Ah, I see. It worked, thank you!