code: function(e) {
  			if(this._shouldMoveColumn(e)){
  				this.moveColumn(null, 1);
  				e.preventDefault();
  				return true;
  			}
  			var curModel = this._modelIterator.cursor();
  			if(!curModel){
  				return false;
  			}
  			if(this.isExpandable(curModel)){
  				if(!this.isExpanded(curModel)){
  					this.explorer.myTree.expand(curModel);
  					if (this.explorer.postUserExpand) {
  						this.explorer.postUserExpand(this.model.getId(curModel));
  					}
  					e.preventDefault();
  					return false;
  				}
  			}
  		}
docs: Right arrow key expands the current row if it is expandable and collapsed.