code: public void addRowAfter(I_CmsEditableGroupRow row) {
  
          int index = m_container.getComponentIndex(row);
          if (index >= 0) {
              Component component = m_newComponentFactory.get();
              I_CmsEditableGroupRow newRow = m_rowBuilder.buildRow(this, component);
              m_container.addComponent(newRow, index + 1);
          }
          updatePlaceholder();
          updateButtonBars();
          updateGroupValidation();
      }
docs: Adds a new row after the given one.
  
  @param row the row after which a new one should be added