private void _projectService_ProjectOpened(object sender, EventArgs e)
{
CogProject project = _projectService.Project;
Set("Varieties", ref _varieties, new MirroredBindableList<Variety, SegmentsVarietyViewModel>(project.Varieties, variety => new SegmentsVarietyViewModel(this, variety), vm => vm.DomainVariety));
PopulateSegments();
}