getFirstAlive(createIfNull, x, y, key, frame) → {DisplayObject}
Get the first child that is alive (child.alive === true). This is handy for choosing a squad leader, etc. You can use the optional argument createIfNull to create a new Game Object if no alive ones were found in this Group. It works by calling Group.create passing it the parameters given to this method, and returning the new child. If a child was found , createIfNull is false and you provided the additional arguments then the chi