code: function() {
      this._destroyResizeableColumns();
      if(util.DD) {
          var oColumn, elTh, elThLiner, elThResizerLiner, elThResizer, elResizerProxy, cancelClick;
          for(var i=0, len=this._oColumnSet.keys.length; i<len; i++) {
              oColumn = this._oColumnSet.keys[i];
              if(oColumn.resizeable) {
                  elTh = oColumn.getThEl();
                  Dom.addClass(elTh, DT.CLASS_RESIZEABLE);
                  elThLiner = oColumn.getThLinerEl();
                  
                  // Bug 1915349: So resizer is as tall as TH when rowspan > 1
                  // Create a separate resizer liner with position:relative
                  elThResizerLiner = elTh.appendChild(document.createElement("div"));
                  elThResizerLiner.className = DT.CLASS_RESIZERLINER;
                  
                  // Move TH contents into the new resizer liner
                  elThResizerLiner.appendChild(elThLiner);
                  
                  // Create the resizer
                  elThResizer = elThResizerLiner.appendChild(document.createElement("div"));
                  elThResizer.id = elTh.id + "-resizer"; // Needed for ColumnResizer
                  elThResizer.className = DT.CLASS_RESIZER;
                  oColumn._elResizer = elThResizer;
  
                  // Create the resizer proxy, once globally
                  elResizerProxy = DT._initColumnResizerProxyEl();
                  oColumn._ddResizer = new YAHOO.util.ColumnResizer(
                          this, oColumn, elTh, elThResizer, elResizerProxy);
                  cancelClick = function(e) {
                      Ev.stopPropagation(e);
                  };
                  Ev.addListener(elThResizer,"click",cancelClick);
              }
          }
      }
      else {
      }
  }
docs: Initializes resizeability on key Column TH elements.
  
  @method _initResizeableColumns
  @private