@Nullable
  @Override
  public Object getData(@NotNull String dataId) {
    if (PlatformCoreDataKeys.BGT_DATA_PROVIDER.is(dataId)) {
      M item = ContainerUtil.getFirstItem(getSelectedMemberInfos());
      if (item == null) return null;
      return (DataProvider)slowId -> getSlowData(slowId, item);
    }
    return null;
  }
@Nullable
  @Override
  public Object getData(@NotNull String dataId)