internal void VerifyGroupMembership(_GAME_3BViewModel bubble)
 {
     _bubbleGroup.Deactivate();
     if (bubble != null)
     {
         _bubbleGroup.FindBubbleGroup(bubble).Activate();
     }
 }
        internal void RemoveBubble(_GAME_3BViewModel bubble)
        {
            if (bubble == null)
            {
                throw new ArgumentNullException("bubble");
            }

            _bubblesInternal.Remove(bubble);
        }
 bool IsInBubbleGroup(_GAME_3BViewModel bubble)
 {
     return(new _3BGroup(this.Bubbles).FindBubbleGroup(bubble).HasBubbles);
 }