int count = 0;
    public void createFile(ActionEvent actionEvent) {
        if (count >4) {
            System.out.println("No more tabs!");
        }else {
            tabBox=new Tab(" Untitled " + (tabPane.getTabs().size() + 1));
            paramMenu(actionEvent);
            tabBox.setContent(anchorParams);
            tabPane.getTabs().add(tabBox);
            tabPane.getSelectionModel().selectNext();
            if (tabPane.getTabs().size() < 2 ) {
                count = 1;
            }
            count++;
        }
        if (count < 1 || tabPane.getTabs().size() == 1 ){
            tabBox.getTabPane().setTabClosingPolicy(TabPane.TabClosingPolicy.UNAVAILABLE);
        } else {
            tabBox.getTabPane().setTabClosingPolicy(TabPane.TabClosingPolicy.SELECTED_TAB);
        }
    }