Force repaint after button click

consider this piece of scala swing code

de开发者_C百科tail.reactions += {
  case ButtonClicked(but) =>
    detail.contents += new Label(but.text)
    detail.background = new java.awt.Color(0,255,0)
}

the detail is of FlowPanel type. When the button is clicked, the color is instantly repainted, but the Label is not. It gets visible as I click the area. How can I force the detail to repaint its contents after a click?

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In Java, the answer would normally be to call repaint(). Did you try detail.repaint()?