code: @Override
      public MarkupContainer add(final Component... _childs)
      {
          MarkupContainer ret = null;
          for (final Component child : _childs) {
              if (child instanceof HtmlHeaderContainer) {
                  ret = add2Page(child);
              } else {
                  ret = body.add(_childs);
              }
          }
          return ret;
      }
docs: Adds a child component to this container or to the body.
  
  @param _childs childrne to add
  @return the markup container
  @throws IllegalArgumentException             Thrown if a child with the same id is replaced by the add operation.