Select root in TreeView before first draw

I have a TreeView with binded ItemsSource. I wan开发者_高级运维t to select my root(first) node. But ItemContainerGenerator has not generated any TreeViewItem objects yet.

Is there any nice way to select the items without using timers/threads and so on ?

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Solved.

In DataTemplate added binding to IsSelected property in my Model. So if i need to select some item, i set IsSelected property in my Model object, not in TreeView