How to reach SelectedItem in nested ListView

Question

I\'m wrestling with these last few days. I found lots of links, but none of them really helped me. I\'m quite a beginner in WPF. All I need is to reach SelectedItem property in

Answer 1

In

SelectedItem="{Binding Path=NestedSelectedItem,
               RelativeSource={RelativeSource AncestorType=vm:MainVM}, ...}

the type vm:MainVM is not an ancestor type of the inner ListView, because it not part of a visual or logical tree.

The AncestorType must be a UI element, e.g. the outer ListView. You would access the property by a nested property Path via its DataContext:

SelectedItem="{Binding Path=DataContext.NestedSelectedItem,
               RelativeSource={RelativeSource AncestorType=ListView}, ...}

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As a note, since you are not setting the View property of the ListViews, you could as well use the simpler base class ListBox instead of ListView: