Add some testing code for #37

src/main/groovy/net/zomis/brainf/ui/MainController.java

@@ -185,6 +185,12 @@ public void initialize(URL url, ResourceBundle resource) {
                 e.consume();
             }
         });
+        tabs.getSelectionModel().selectedItemProperty().addListener(this::tabChange);
+    }
+
+    private void tabChange(ObservableValue<? extends Tab> observable, Tab oldValue, Tab newValue) {
+        tabMap.get(newValue).getCodeArea().requestFocus();
+        System.out.println("change tab to " + newValue.getText());
     }
 
     @FXML void close() {

src/main/groovy/net/zomis/brainf/ui/MemoryListCell.groovy

@@ -0,0 +1,24 @@
+package net.zomis.brainf.ui
+
+import javafx.scene.control.ListCell
+import javafx.scene.control.TextField
+
+/**
+ * Created by Simon on 12/5/2015.
+ */
+class MemoryListCell extends ListCell<String> {
+
+    private TextField textField
+
+    MemoryListCell() {
+        super()
+        textField = new TextField()
+        this.getChildren().add(textField)
+    }
+
+    @Override
+    protected void updateItem(String item, boolean empty) {
+        super.updateItem(item, empty)
+        textField.setText(item)
+    }
+}