<TableView fx:id="timelineTable" VBox.vgrow="ALWAYS">
 <columns>
    <TableColumn fx:id="dateColumn" prefWidth="85.0" text="%timeline.date" />
 </columns>
</TableView>

Callback<TableColumn<String, String>, TableCell<String, String>> cellFactory = new Callback<TableColumn<String, String>, TableCell<String, String>>() {
        @Override
        public TableCell call(final TableColumn<String, String> param) {
            final TableCell<String, String> cell = new TableCell<String, String>() {

                final Button btn = new Button("Just Do It");

                @Override
                public void updateItem(String item, boolean empty) {
                    super.updateItem(item, empty);
                    if (empty) {
                        setGraphic(null);
                        setText(null);
                    } else {
                        btn.setOnAction(event -> {
                            // do something
                        });
                        setGraphic(btn);
                        setText(null);
                    }
                }
            };
            return cell;
        }
    };