AcDbGroup 添加新成员，以及往组里面添加实体

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1. AcDbGroup *pGroup = new AcDbGroup;
2. AcDbObjectId  groupObjectId;
3. AcDbDictionary  *pGroupDict = NULL;
4. acdbCurDwg()->getGroupDictionary(pGroupDict, AcDb::kForWrite);
5. pGroupDict->setAt("GroupName", pGroup, groupObjectId);//在AcdbGroup词典里面添加一项名为GroupName
8. pGroupDict->close();
10. //如果想实体添加到组里面 将打开的实体ID传入 组里面就行了
11. pGroup->append(objectId1);     // objectId1 and objectId2
12.                                                  // are objId's of the
13. pGroup->append(objectId2);     // entities which will be in the group.
15. pGroup->close();

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