private void tg_highlightStrategy_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
foreach (var item in tg_Area.VertexList)
{
HighlightBehaviour.SetHighlightStrategy(item.Value, (HighlightStrategy)tg_highlightStrategy.SelectedItem);
}
foreach (var item in tg_Area.EdgesList)
{
HighlightBehaviour.SetHighlightStrategy(item.Value, (HighlightStrategy)tg_highlightStrategy.SelectedItem);
}
}