adding id´s to buttons and textarea

src/sample/sample.fxml

@@ -8,12 +8,12 @@
 
 <AnchorPane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="498.0" prefWidth="700.0" xmlns="http://javafx.com/javafx/11.0.1" xmlns:fx="http://javafx.com/fxml/1">
    <children>
-      <Button layoutX="100.0" layoutY="423.0" mnemonicParsing="false" prefHeight="35.0" prefWidth="129.0" text="Submit thought" />
-      <TextArea layoutX="59.0" layoutY="299.0" prefHeight="106.0" prefWidth="307.0" promptText="Write your thought here..." />
+      <Button id="submitButton" layoutX="100.0" layoutY="423.0" mnemonicParsing="false" prefHeight="35.0" prefWidth="129.0" text="Submit thought" />
+      <TextArea id="textBox" layoutX="59.0" layoutY="299.0" prefHeight="106.0" prefWidth="307.0" promptText="Write your thought here..." />
       <Text layoutX="65.0" layoutY="31.0" strokeType="OUTSIDE" strokeWidth="0.0" text="Your thoughts" />
       <ScrollPane layoutX="1.0" layoutY="40.0" prefHeight="258.0" prefWidth="700.0">
          <content>
-            <Text strokeType="OUTSIDE" strokeWidth="0.0" text="Text" wrappingWidth="33.22460746765137" />
+            <Text id="thoughtId" strokeType="OUTSIDE" strokeWidth="0.0" text="Text" wrappingWidth="33.22460746765137" />
          </content>
       </ScrollPane>
    </children>