private void rollbackToolStripMenuItem_Click(object sender, EventArgs e)
{
EUListItemVersion version = (EUListItemVersion)ListItemVersionsDataGridView.SelectedRows[0].Tag;
List <EUListItemVersion> versions = SharePointManager.RestoreVersion(version.SiteSetting, version.WebURL, version.URL, version.Version);
LoadVersions(versions);
}