How to define nested columns in JavaFX within the fxml file?

Question

I would like produce the following table using fxml:

So, I wonder how can I nest the columns Primary and Secondary inside Email Address?

Answer 1

After checking some code in this link, I was able to figure it out.

<TableView fx:id="tableView" GridPane.columnIndex="0" GridPane.rowIndex="1">
    <columns>
        <TableColumn fx:id="firstNameColumn" text="First Name" prefWidth="100"/>
        <TableColumn text="Last Name" prefWidth="100"/>
        <TableColumn text="Email Address" prefWidth="300">
            <columns>
                <TableColumn text ="Primary" prefWidth="150"/>
                <TableColumn text ="Secondary" prefWidth="150"/>
            </columns>
        </TableColumn>
    </columns>
</TableView>