private void OnEnable()
        {
            _activeStyleSheet = null;

            if (StyleSheet != null)
            {
                OnStyleSheetChanged();
            }
        }
        private void OnStyleSheetChanged()
        {
            _activeStyleSheet = StyleSheet;

            BroadcastMessage("SRStyleDirty", SendMessageOptions.DontRequireReceiver);
        }
 public void SetDirty()
 {
     _activeStyleSheet = null;
 }