code: function(theadCell) {
      var elTh;
  
      // Validate Column instance
      if(theadCell instanceof YAHOO.widget.Column) {
          var oColumn = theadCell;
          elTh = oColumn.getThEl();
          if(elTh) {
              return elTh;
          }
      }
      // Validate HTML element
      else {
          var el = Dom.get(theadCell);
  
          if(el && (el.ownerDocument == document)) {
              // Validate TH element
              if(el.nodeName.toLowerCase() != "th") {
                  // Traverse up the DOM to find the corresponding TR element
                  elTh = Dom.getAncestorByTagName(el,"th");
              }
              else {
                  elTh = el;
              }
  
              return elTh;
          }
      }
  
      return null;
  }
docs: Returns DOM reference to a TH element.
  
  @method getThEl
  @param theadCell {YAHOO.widget.Column | HTMLElement | String} Column instance,
  DOM element reference, or string ID.
  @return {HTMLElement} Reference to TH element.