Empty tab pane has buttons now, need to add the appropriate Action

src/main/java/edu/kit/formal/gui/controls/CustomTabPaneSkin.java

 package edu.kit.formal.gui.controls;
 
 import com.sun.javafx.scene.control.skin.TabPaneSkin;
+import javafx.geometry.Pos;
 import javafx.scene.Node;
 import javafx.scene.control.TabPane;
 import javafx.scene.layout.Pane;
@@ -19,16 +20,9 @@ public class CustomTabPaneSkin extends TabPaneSkin {
     public CustomTabPaneSkin(TabPane tabPane) {
         super(tabPane);
         placeHolder = new PlaceHolderTab();
-        //placeHolderText = new Label( "Empty" );
-        //placeHolderText.setFont( Font.font( null, FontWeight.BOLD, 20 ) );
-        //placeHolderText.setAlignment( Pos.CENTER );
-
-        //placeHolderText.minWidthProperty().bind( getSkinnable().widthProperty() );
-        //placeHolderText.minHeightProperty().bind( getSkinnable().heightProperty() );
-
-        //placeHolder = new VBox( placeHolderText );
-        placeHolder.minWidthProperty().bind(getSkinnable().widthProperty());
-        placeHolder.minHeightProperty().bind(getSkinnable().heightProperty());
+        placeHolder.getVbox().minWidthProperty().bind(getSkinnable().widthProperty());
+        placeHolder.getVbox().minHeightProperty().bind(getSkinnable().heightProperty());
+        placeHolder.getVbox().setAlignment(Pos.CENTER);
         for (Node node : getChildren()) {
             if (node.getStyleClass().contains("tab-header-area")) {
 

src/main/java/edu/kit/formal/gui/controls/PlaceHolderTab.java

 package edu.kit.formal.gui.controls;
 
-import javafx.geometry.Insets;
+import javafx.geometry.Pos;
 import javafx.scene.control.Button;
+import javafx.scene.layout.FlowPane;
 import javafx.scene.layout.VBox;
 
 /**
  * Replacement for empty Tab with two buttons
  */
-public class PlaceHolderTab extends VBox {
-
+public class PlaceHolderTab extends FlowPane {
 
+    /**
+     * Button to open a new script
+     */
     private final Button newScript = new Button("New Script");
 
+    /**
+     * Button to open a script
+     */
     private final Button openScript = new Button("Open Script");
+    private VBox vbox;
 
+    /**
+     * Pane holding the buttons for an empty tab
+     */
     public PlaceHolderTab() {
-        this.setPadding(new Insets(10, 50, 50, 50));
-        this.setSpacing(10);
+        vbox = new VBox();
+
+        newScript.setMaxSize(Double.MAX_VALUE, Double.MAX_VALUE);
+        openScript.setMaxSize(Double.MAX_VALUE, Double.MAX_VALUE);
+        newScript.setAlignment(Pos.CENTER);
+        openScript.setAlignment(Pos.CENTER);
+        vbox.getChildren().add(newScript);
+        vbox.getChildren().add(openScript);
+        vbox.setAlignment(Pos.CENTER);
+        this.getChildren().add(vbox);
+    }
 
-        this.getChildren().add(newScript);
-        this.getChildren().add(openScript);
+    public VBox getVbox() {
+        return vbox;
     }
 
     public Button getNewScript() {