@Override
  public void saveContext(@NotNull Project project, @NotNull Element toElement) throws WriteExternalException {
    for (AbstractProjectViewPane pane : AbstractProjectViewPane.EP.getExtensions(project)) {
      Element paneElement = new Element(pane.getId());
      pane.writeExternal(paneElement);
      toElement.addContent(paneElement);
    }
  }
@Override
  public void saveContext(@NotNull Project project, @NotNull Element toElement)