Nifty - update scrollbar (solved)

Troubleshooting gui
1

Hi, I am trying to implement a scrollbar into my project. The current status is that I was able to implement the scrollpanel which holds all elements. The problem is that the scrollbar does not update. I also tried to use setUp(…).

private Element parentPanel;
private static Element scrollPanel, parentPanelElement;
private PanelCreator createContentPanel;
private ScrollPanelBuilder scrollPanelBuilder;

(methods to create draggable Window)

public void addScrollPanel(){
    
    parentPanel = screen.findElementByName(windowName + "-Main" + (idCountMain-1));
    scrollPanelBuilder = new ScrollPanelBuilder(windowName + "-Content" + idCountContent);
    scrollPanelBuilder.width("*");
    scrollPanelBuilder.height("*");
    scrollPanelBuilder.style("nifty-panel-simple");
    scrollPanelBuilder.set("horizontal", "false");
    scrollPanelBuilder.set("vertical", "true");
    scrollPanel = scrollPanelBuilder.build(nifty, screen, parentPanel);
    idCountContent++;
    
    parentPanelElement = screen.findElementByName("#nifty-scrollpanel-child-root");
    createContentPanel = new PanelCreator();
    createContentPanel.setId(windowName + "-Content" + idCountContent);
    createContentPanel.setHeight("100%");
    createContentPanel.setWidth("100%");
    createContentPanel.setChildLayout("vertical");
    createContentPanel.setStyle("nifty-panel-simple");
    createContentPanel.create(nifty, screen, parentPanelElement);
    idCountContent++;

    createContentItems();
}

@Override
public void createContentItems() {
    for (int i = 0; i < list.size(); i++) {
        this.addContentItem(list.getObject(i));
    }
}

public void addContentItem(Object object){

    parentPanel = screen.findElementByName(windowName + "-Content5");
    createContentPanel = new PanelCreator();
    createContentPanel.setId(windowName + "-Content" + idCountContent);
    createContentPanel.setHeight("10%");
    createContentPanel.setWidth("100%");
    createContentPanel.setChildLayout("horizontal");
    createContentPanel.setStyle("nifty-panel-simple");
    createContentPanel.create(nifty, screen, parentPanel);
    idCountContent++;
    
    (more panels...)
    
    parentPanelElement.layoutElements();
    scrollPanel.getNiftyControl(ScrollPanel.class).setUp( 0, 20, 0, 20*10,   ScrollPanel.AutoScroll.OFF);
}