protected override void OnSizeAllocated(Gdk.Rectangle allocation)
{
base.OnSizeAllocated(allocation);
Gtk.Requisition table_req = table.ChildRequisition;
allocation.X = Math.Max((allocation.Width - table_req.Width) / 2, 0);
allocation.Y = Math.Max((allocation.Height - table_req.Height) / 2, 0);
allocation.Width = table_req.Width;
allocation.Height = table_req.Height;
table.SizeAllocate(allocation);
}
