Select and focus a listbox-item

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C#

.NET

WPF

ListBox

I have a WPF ListBox with the ItemsSource bound to a ViewModels list of MyObjects (products). This works fine, the lisbox will be filled with products from Database. Unfortunatly there are over 4.000 entries in the DB. When the user navigates to the listbox, a specific product entry should be selected and focused, just like when the user clicks a specific entry with the mouse. Is the a simple way in WPF to solve this?
Binding the selected item with XAML like this works:

<ListBox SelectedItem="{Binding SelectedArtikel, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" />

but the selected item is somewhere deep in the list. The selected item is marked as selected but not in sight, you have to scroll down manually.

Regards

What I have tried:

I tried:

lbxArtikel.UpdateLayout();
var lbxItem = (ListBoxItem)lbxArtikel
	.ItemContainerGenerator
	.ContainerFromItem(lbxArtikel.SelectedItem);
lbxItem.Focus();

But this selected only the first entry.