code: @Override
      protected void initView() {
  
          this.undoButton = new Button("Undo");
          this.redoButton = new Button("Redo");
  
          this.addCircleButton = new Button("Add Circle");
          this.addSquareButton = new Button("Add Square");
          this.addRectangleButton = new Button("Add Rectangle");
  
          node().setTop(FlowPaneBuilder.create()
                                       .children(this.undoButton, this.redoButton, this.addCircleButton, this.addSquareButton, this.addRectangleButton)
                                       .build());
  
          this.editor = PaneBuilder.create().style("-fx-background-color:beige").build();
  
          node().setCenter(this.editor);
  
      }
docs: {@inheritDoc}