void OnOpenActivated(object sender, System.EventArgs e)
{
Gtk.FileChooserDialog d = new Gtk.FileChooserDialog ("Open Profile Log", this, Gtk.FileChooserAction.Open, chooser_button_params);
if (d.Run () == (int) Gtk.ResponseType.Accept)
OpenProfile (d.Filename);
d.Destroy ();
}