code: function (oDD, oTargetDD) {
              var targets = this.getRelated(oDD, true);
              for (var i=0, len=targets.length;i<len;++i) {
                  if (targets[i].id == oTargetDD.id) {
                      return true;
                  }
              }
  
              return false;
          }
docs: Returns true if the specified dd target is a legal target for
  the specifice drag obj
  @method isLegalTarget
  @param {DragDrop} the drag obj
  @param {DragDrop} the target
  @return {boolean} true if the target is a legal target for the
  dd obj
  @static