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wpf - How to get or compute actual width of ListBox without Vertical Scrollbar if visible

I wonder how to get or compute actual width of ListBox without Vertical Scrollbar if visible.

What I want to do is changing width of each items inside ListBox without being covered by Vertical Scrollbar.

Width="{Binding ActualWidth, 
    RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type ListBox}}}

At least, above binding tell me the actual width of ListBox, but this one does not handle width of vertical scrollbar.

Is there any good way to solve this?

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Try binding to the ViewportWidth property of the containing ScrollViewer instead.

Like this:

Width="{Binding Path=ViewportWidth, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=ScrollViewer}}"

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