layout..xml

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


<?import javafx.scene.layout.*?>
<GridPane maxHeight="-Infinity" maxWidth="-Infinity"  prefHeight="720" prefWidth="1280" fx:controller="dev.nhh.echoclient.controller.LayoutController" xmlns:fx="http://javafx.com/fxml" stylesheets="@layout.css">
    <children>

        <!-- Top Menu -->
        <fx:include GridPane.rowIndex="0" source="/menu/menu.fxml"></fx:include>

        <!-- Left Pane -->
        <fx:include GridPane.columnIndex="0" GridPane.rowIndex="1" source="/channel/channel.fxml"></fx:include>

        <!-- Right Pane -->
        <fx:include GridPane.columnIndex="1" GridPane.rowIndex="1" source="/content/content.fxml"></fx:include>

    </children>

    <columnConstraints>
        <ColumnConstraints hgrow="SOMETIMES" percentWidth="40.0"/>
        <ColumnConstraints hgrow="SOMETIMES" percentWidth="60.0"/>
    </columnConstraints>

    <rowConstraints>
        <RowConstraints percentHeight="5" vgrow="SOMETIMES" />
        <RowConstraints percentHeight="95" vgrow="SOMETIMES" />
    </rowConstraints>

</GridPane>