private void MenuItemPropertiesClick(object sender, EventArgs e)
{
if (_clickedEvent == null)
return;
var ed = new EventDetails { Event = _clickedEvent.Event };
if (ed.ShowDialog(this) == DialogResult.OK)
{
_events.Remove(_clickedEvent.Event);
_events.Add(ed.NewEvent);
Refresh();
}
_clickedEvent = null;
}