void AddFollowState(eFollowState uiFollowState)
 {
     m_uiFollowState |= uiFollowState;
 }
 void RemoveFollowState(eFollowState uiFollowState)
 {
     m_uiFollowState &= ~uiFollowState;
 }
 bool HasFollowState(eFollowState uiFollowState)
 {
     return((m_uiFollowState & uiFollowState) != 0);
 }