Abacus/src/main/resources/abacus.fxml

<?xml version="1.0" encoding="UTF-8"?>

<?import javafx.scene.control.*?>
<?import javafx.scene.layout.*?>

<BorderPane xmlns="http://javafx.com/javafx"
            xmlns:fx="http://javafx.com/fxml"
            fx:controller="org.nwapw.abacus.fx.AbacusController">
    <center>
        <TabPane>
            <Tab text="Calculator" closable="false"/>
            <Tab text="Settings" closable="false"/>
        </TabPane>
    </center>
</BorderPane>