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java - Action Buttons css style in JavaFX ControlFX dialog

I've been using ControlsFX dialogs to show information, but the style of my application is not blue, and does not match dialog style (color, borders) is there a way to change the button color or styles?

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Since you don't provide the version you are using, I'll go with the new OpenJFX-Dialogs project (source, started since 8.20.7 version), which are by the way the same dialogs we'll have with JDK8u40.

Firts, let's add some alert dialog:

@Override
public void start(Stage primaryStage) {
    Alert alert = new Alert(AlertType.CONFIRMATION);
    alert.setTitle("Confirmation Dialog");
    alert.setHeaderText("This is a Regular Confirmation Dialog");
    alert.setContentText("This is the message");

    Button button = new Button("Click to display an alert");
    button.setOnAction(e->{
        Optional<ButtonType> result = alert.showAndWait();
        result.ifPresent(System.out::println);
    });

    Scene scene = new Scene(new StackPane(button), 300, 200);
    primaryStage.setScene(scene);
    primaryStage.show();
}

Regular Alert Dialog

Now, to style this dialog, we need an instance of DialogPane, which is the root node within a dialog, where the header, the content and the buttons are displayed.

Via lookups or via getChildren() it's easy to find these components.

This is an example of customizing all of the components of the dialog:

@Override
public void start(Stage primaryStage) {
    Alert alert = new Alert(AlertType.CONFIRMATION);
    alert.setTitle("Confirmation Dialog");
    alert.setHeaderText("This is a Custom Confirmation Dialog");
    alert.setContentText("We override the style classes of dialog.css");

    Button button = new Button("Click to display an alert");
    button.setOnAction(e->{
        Optional<ButtonType> result = alert.showAndWait();
        result.ifPresent(System.out::println);
    });

    Scene scene = new Scene(new StackPane(button), 300, 200);
    primaryStage.setScene(scene);
    primaryStage.show();

    DialogPane dialogPane = alert.getDialogPane();
// root
    dialogPane.setStyle("-fx-background-color: greenyellow;");

// 1. Grid
    // remove style to customize header
    dialogPane.getStyleClass().remove("alert");

    GridPane grid = (GridPane)dialogPane.lookup(".header-panel"); 
    grid.setStyle("-fx-background-color: cadetblue; "
            + "-fx-font-style: italic;");

    // custom icon
    StackPane stackPane = new StackPane(new ImageView(
            new Image(getClass().getResourceAsStream("lock24.png"))));
    stackPane.setPrefSize(24, 24);
    stackPane.setAlignment(Pos.CENTER);
    dialogPane.setGraphic(stackPane);

// 2. ContentText with just a Label
    dialogPane.lookup(".content.label").setStyle("-fx-font-size: 16px; "
            + "-fx-font-weight: bold; -fx-fill: blue;");

// 3- ButtonBar
    ButtonBar buttonBar = (ButtonBar)alert.getDialogPane().lookup(".button-bar");
    buttonBar.setStyle("-fx-font-size: 24px;"
            + "-fx-background-color: indianred;");
    buttonBar.getButtons().forEach(b->b.setStyle("-fx-font-family: "Andalus";"));

}

And this is how it looks like:

Custom Alert Dialog


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