Mine

        class ButtonClickModel {
            attribute numClicks: Number;
        }

        var model = new ButtonClickModel();

        var win = Frame {
            width: 200
            content: GridPanel {
                border: EmptyBorder {
                   top: 30
                   left: 30
                   bottom: 30
                   right: 30
                }
                rows: 2
                columns: 1
                vgap: 10
                cells:
                [Button {
                     text: "I'm a button!"
                     mnemonic: I
                     action: operation() {
                         model.numClicks++;
                    }
                },
                Label {
                    text: bind "Number of button clicks: {model.numClicks}"
                }]
            }
            visible: true
        };