main_controller.fxml

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

<?import javafx.scene.control.Menu?>
<?import javafx.scene.control.MenuBar?>
<?import javafx.scene.control.MenuItem?>
<?import javafx.scene.layout.AnchorPane?>
<?import javafx.scene.layout.ColumnConstraints?>
<?import javafx.scene.layout.GridPane?>
<?import javafx.scene.layout.RowConstraints?>
<?import javafx.scene.layout.VBox?>

<AnchorPane fx:id="anchorPane" prefHeight="600.0" prefWidth="800.0" xmlns="http://javafx.com/javafx/8.0.65" xmlns:fx="http://javafx.com/fxml/1" fx:controller="de.brickedleveleditor.ui.controller.MainController">
   <children>
      <MenuBar layoutX="40.0" AnchorPane.leftAnchor="0.0" AnchorPane.rightAnchor="0.0" AnchorPane.topAnchor="0.0">
        <menus>
            <Menu mnemonicParsing="false" text="File">
              <items>
                <MenuItem fx:id="saveMenuItem" mnemonicParsing="false" onAction="#onSaveMenuItemClicked" text="Save" />
                  <MenuItem mnemonicParsing="false" text="Unspecified Action" />
              </items>
            </Menu>
          <Menu mnemonicParsing="false" text="Help">
            <items>
              <MenuItem mnemonicParsing="false" onAction="#about" text="Über" />
            </items>
          </Menu>
        </menus>
      </MenuBar>
      <VBox fx:id="sidebarVBox" alignment="CENTER" layoutX="614.0" layoutY="29.0" prefHeight="572.0" prefWidth="186.0" AnchorPane.bottomAnchor="-1.0" AnchorPane.topAnchor="29.0" />
      <GridPane fx:id="gridPane" alignment="CENTER" gridLinesVisible="true" layoutX="14.0" layoutY="58.0" prefHeight="526.0" prefWidth="595.0" AnchorPane.bottomAnchor="16.0" AnchorPane.leftAnchor="14.0" AnchorPane.rightAnchor="191.0" AnchorPane.topAnchor="58.0">
        <columnConstraints>
          <ColumnConstraints hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" />
          <ColumnConstraints hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" />
        </columnConstraints>
        <rowConstraints>
          <RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
          <RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
          <RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
        </rowConstraints>
      </GridPane>
   </children>
</AnchorPane>