The program below works fine if the line value.setCellFactory(NUMBER_CELL_FACTORY); is commented out.

If it is included however, the TableView behaves weirdly (on JavaFX 8 b106) - if you simply copy the code, launch it and click a few times on the `+` button, you will see content appearing in empty rows at the bottom of the table, and the colours are not as they should be.

Note: adding if (empty) { setText(null); setGraphic(null); } solves the first issue (content in empty cells) but the colours are still not applied correctly.

    import javafx.application.Application;
    import javafx.beans.property.DoubleProperty;
    import javafx.beans.property.SimpleDoubleProperty;
    import javafx.scene.Scene;
    import javafx.scene.control.Button;
    import javafx.scene.control.TableCell;
    import javafx.scene.control.TableColumn;
    import javafx.scene.control.TableView;
    import javafx.scene.control.cell.PropertyValueFactory;
    import javafx.scene.layout.AnchorPane;
    import javafx.scene.layout.VBox;
    import javafx.scene.paint.Color;
    import javafx.stage.Stage;
    import javafx.util.Callback;
    
    public class TestFX extends Application {
    
        @Override
        public void start(final Stage stage) throws Exception {
            MyTable table = new MyTable();
    
            Scene scene = new Scene(table);
    
            stage.setScene(scene);
            stage.show();
        }
    
        public static void main(String[] args) {
            launch(TestFX.class);
        }
    
        static class MyTable extends AnchorPane {
    
            private static final Callback NUMBER_CELL_FACTORY = (p) -> new NumberTableCell<>();
    
            private final Button addRow = new Button("+");
            private final TableView<Item> table = new TableView<>();
    
            MyTable() {
                super();
                initTableView();
                addRow.setOnMouseClicked((e) -> addItem());
                VBox vbox = new VBox();
                vbox.getChildren().addAll(addRow, table);
                getChildren().add(vbox);
            }
    
            public void addItem() {
                table.getItems().add(new Item());
            }
    
            private void initTableView() {
                TableColumn<Item, Double> value = new TableColumn<>("Value");
                value.setCellValueFactory(new PropertyValueFactory<>("value"));
                value.setCellFactory(NUMBER_CELL_FACTORY);
    
                table.getColumns().add(value);
                table.setColumnResizePolicy(TableView.CONSTRAINED_RESIZE_POLICY);
            }
        }
    
        public static class Item {
            private final DoubleProperty value = new SimpleDoubleProperty();
    
            public DoubleProperty valueProperty() {
                return value;
            }
        }
    
        static class NumberTableCell<T> extends TableCell<T, Double> {
            private final Color fill = Color.RED;
    
            @Override
            protected void updateItem(Double item, boolean empty) {
                super.updateItem(item, empty);
                if (empty) return;
                setText(String.valueOf(item));
                setTextFill(fill);
            }
        }
    }