code: function(sGroup) {
          this.logger.log("Removing from group: " + sGroup);
          if (this.groups[sGroup]) {
              delete this.groups[sGroup];
          }
  
          this.DDM.removeDDFromGroup(this, sGroup);
      }
docs: Remove's this instance from the supplied interaction group
  @method removeFromGroup
  @param {string}  sGroup  The group to drop