private void but_agemapdata_Click(object sender, EventArgs e)
{
var removed = ((PureImageCache)MyImageCache.Instance).DeleteOlderThan(DateTime.Now.AddDays(-30),
FlightData.instance.gMapControl1.MapProvider.DbId);
CustomMessageBox.Show("Removed " + removed + " images");
log.InfoFormat("Removed {0} images", removed);
}