public static @Nullable RadContainer getSelectionParent(final List<? extends RadComponent> selection) {
    RadContainer parent = null;
    for (RadComponent c : selection) {
      if (parent == null) {
        parent = c.getParent();
      }
      else if (parent != c.getParent()) {
        parent = null;
        break;
      }
    }
    return parent;
  }
public static @Nullable RadContainer getSelectionParent(final List<? extends RadComponent> selection)