code: @SuppressWarnings("unchecked")
      public <T extends XPathBuilder> T setContainer(WebLocator container) {
          this.container = container;
          return (T) this;
      }
docs: <p><b>Used for finding element process (to generate xpath address)</b></p>
  
  @param container parent containing element.
  @param <T>       the element which calls this method
  @return this element