code: public static RadialMenuSection add(ContextRadialMenu owner, RadialPane pane, Menu menu, RadialMenuSection parentSection, Double angularAxisDeg) {
  
          final RadialMenuSection section = new RadialMenuSection(owner, pane, menu, parentSection, angularAxisDeg);
  
          pane.addSection(menu, section);
  
          return section;
      }
docs: Create new RadialMenuSection
  
  @param owner          Radial Menu the new section should belong to
  @param pane           Radial Pane on which to add the items
  @param menu           Menu to represent
  @param parentSection  Parent RadialMenuSection (can be null)
  @param angularAxisDeg Explicit angular axis (can be null)
  @return New RadialMenuSection