private void MoveTop()
{
if (_curList.SelectedIndices.Count == 0) return;
int idx = _curList.SelectedIndices[0];
if (_statuses.SortOrder == SortOrder.Ascending)
{
_curList.EnsureVisible(_curList.VirtualListSize - 1);
}
else
{
_curList.EnsureVisible(0);
}
_curList.EnsureVisible(idx);
}