code: @SuppressWarnings("unchecked")
      public <T extends XPathBuilder> T setPosition(final Position position) {
          this.position = position.getValue();
          return (T) this;
      }
docs: <p><b>Used for finding element process (to generate xpath address)</b></p>
  <p>Result Example:</p>
  <pre>
  //*[contains(@class, 'x-grid-panel')][last()]
  </pre>
  
  @param position {@link Position}
  @param <T>      the element which calls this method
  @return this element