code: protected void initContent(CmsCheckBox checkbox, Widget mainWidget) {
  
          addCheckBox(checkbox);
          addMainWidget(mainWidget);
          initContent();
      }
docs: This method is a convenience method which sets the checkbox and main widget of this widget, and then calls {@link CmsListItem#initContent()}.<p>
  
  @param checkbox the checkbox to add
  @param mainWidget the mainWidget to add