To reproduce run following code



import javafx.application.Application;
import javafx.beans.property.StringProperty;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.scene.Node;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Hyperlink;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableView;
import javafx.scene.layout.VBox;
import javafx.scene.paint.Color;
import javafx.scene.shape.Rectangle;
import javafx.stage.Stage;

public class TableViewShape extends Application {

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

    private Parent getContent() {
        VBox list = new VBox(10);

        ObservableList<Person> items = FXCollections.observableArrayList();
        for (int i = 0; i < 10; i++) {
            items.add(new Person("name " + i, "surname " + i));
        }
        TableColumn<Node> column1 = new TableColumn<Node>("First Name");
        column1.setProperty("firstName");
        TableColumn<Node> column2 = new TableColumn<Node>("Last Name");
        column2.setProperty("lastName");
        TableView table = new TableView(items);
        table.getColumns().setAll(column1, column2);
        table.setPrefHeight(200);
        table.setFocusTraversable(false);
        table.setStyle("-fx-shape: "
                    + "\"M 50 50 L 150 50 L 100 150 Z\";-fx-background-color: red;");
        table.setMaxSize(200, 300);
        list.getChildren().add(table);
        return list;
    }

    public void start(Stage stage) {
        stage.setX(100);
        stage.setY(100);
        stage.setWidth(300);
        stage.setHeight(300);
        Scene scene = new Scene(getContent());
        stage.setScene(scene);
        stage.setVisible(true);
    }

    public static class Person {

        Person(String firstName, String lastName) {
            this.firstName = new StringProperty(firstName);
            this.lastName = new StringProperty(lastName);
        }
        public StringProperty firstName;

        public void setFirstName(String value) {
            firstName.set(value);
        }

        public String getFirstName() {
            return firstName.get();
        }

        public StringProperty firstNameProperty() {
            if (firstName == null) {
                firstName = new StringProperty();
            }
            return firstName;
        }
        public StringProperty lastName;

        public void setLastName(String value) {
            lastName.set(value);
        }

        public String getLastName() {
            return lastName.get();
        }

        public StringProperty lastNameProperty() {
            if (lastName == null) {
                lastName = new StringProperty();
            }
            return lastName;
        }
    }
}