How does Conductor<IScreen>.Collection.OneActive.ActivateItem work?

[ShuhuaGao]

From the wiki

Calling ActivateItem will add the item passed to the Items collection, and will also activate it and set it as the ActiveItem

I then check the source code to learn about the internals. However, I cannot figure out where the item is added to Items. Supposing I have a new viewmodel instance item and try ActivateItem(item), the source code should go to ChangeActiveItem. However, inside the ChangeActiveItem method, I did not see how item was added to Items. Could you give some explanation?

Besides, consider the following snippet

// item is a view model instance
Items.Add(item);
ActivateItem(item);

Will item be added twice? If not, where is the repetition checked? Thank you.

[canton7]

Here

[ShuhuaGao]

Thanks for the quick reply. My mistake. I did not notice the override and actually referred to the base version.