void HandleRowCollapsed(object o, Gtk.RowCollapsedArgs args)
{
Gtk.TreeIter it;
if (Widget.Model.GetIter (out it, args.Path)) {
CurrentEventRow = new IterPos (-1, it);
ApplicationContext.InvokeUserCode (delegate {
EventSink.OnRowCollapsed (new IterPos (-1, it));
});
}
}