JavaFX

I have the following JavaFX FXML structure:

<BorderPane fx:id="mainWindow" prefHeight="500.0" prefWidth="800.0" styleClass="mainFxmlClass" xmlns:fx="http://javafx.com/fxml/1">

    <stylesheets>
        <URL value="@mainwindow.css"/>
    </stylesheets>

    <top>
        <fx:include fx:id="buttonPanel" source="/com/example/app/chart/buttons/buttonPanel.fxml" />
    </top>
    <center>
        <BorderPane fx:id="chartContainer">
            <center>
                <fx:include fx:id="chartPanel" source="/com/example/app/chart/chartpanel/chartPanel.fxml" />
            </center>
            <right>
                <fx:include fx:id="rightAxisPanel" source="/com/example/app/chart/rightaxis/rightAxisPanel.fxml" />
            </right>
        </BorderPane>
    </center>

</BorderPane>

Being chartPanel and rightAxisPanel:

<AnchorPane fx:id="chartPanel" styleClass="chartPanelClass" xmlns:fx="http://javafx.com/fxml/1">
    <stylesheets>
        <URL value="@chartpanel.css"/>
    </stylesheets>
</AnchorPane>

and

<AnchorPane fx:id="rightAxisPanel" prefWidth="100.0" minWidth="100.0" styleClass="rightAxisPanelClass" xmlns:fx="http://javafx.com/fxml/1">
    <stylesheets>
        <URL value="@rightaxispanel.css"/>
    </stylesheets>
</AnchorPane>

This generates the following figure:

So far, so good.

But if I reduce the size of the window, the right panel is the one that is truncated -see how yellow area which corrsponds to the rigthAxisPanel is truncated-.

How can I do to get the central panel the one being truncated?