import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.*;
import javafx.scene.layout.*;
import javafx.stage.Stage;

public class RT25274 extends Application {

    public static void main(String[] args) { launch(args); }


    @Override public void start(Stage stage) throws Exception {
        VBox vb = new VBox();

        Button b = new Button("Text text text text text text");
        b.setWrapText(true);

        Slider s = new Slider(0, 100, 100);
        s.valueProperty().bindBidirectional(b.prefWidthProperty());

        Pane pane = new Pane();
        pane.setPrefSize(200, 200);

        pane.getChildren().add(b);

        vb.getChildren().addAll(pane, s);

        stage.setScene(new Scene(vb, 300, 300));
        stage.show();
    }
}