The JFXtras XGrid is a general purpose layout container for JavaFX applications.

Sample Grid:

Stage {
    title: "Find Duplicate Files"
    scene: ResizableScene {
        width: 640
        height: 480
        content: Grid {
            rows: [
                row([fileList, duplicateList]),
                row([Cell {
                    content: progressBar
                    hspan: 2
                    fill: HORIZONTAL
                } ]),
                row([Cell {
                    hspan: 2
                    content: Grid {
                        rows: row([
                            Cell {
                                content: statusText
                                hgrow: ALWAYS
                            }
                            deleteButton
                        ])
                    }
                } ])
            ]
        }
    }
}