private void buttonMoveDown_Click(object sender, EventArgs e)
{
if (listRules.SelectedItems.Count != 1)
return;
int id = Convert.ToInt32(listRules.SelectedItems[0].Tag);
hMailServer.Rule rule = _rulesCollection.get_ItemByDBID(id);
rule.MoveDown();
ListRules();
SelectRule(id);
}