docs: public boolean addSubPanels(Container parent)
      {
          if (parent == null)
              parent = this;
  
          LayoutManager layout = this.getScreenLayout(parent);
          parent.setLayout(layout);
  
          if (this.getFieldList() != null)
          {
  // Column 0: (Labels)
              this.addScreenLabels(parent);
  // Column 1 and 2: (Edit boxes)
              this.addScreenControls(parent);
          }
          return true;
      }