C# WPF Binding Get Reference To Source Row From Selected Item

Binding a ListView:

ItemsSource="{Binding Path=DF.DocFieldEnum1rows, Mode=OneWay}".  

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DF.DocFieldEnum1rows is List<DocFieldEnum1row>.

Item template binding:

<Button  Content="{Binding Path=FieldEnum1Row.StrValue, Mode=OneWay}" 
    Click="Button_Click" />.  

In the Button_Click I get access to the Path=FieldEnum1Row.StrValue value, but how can I get access to the source DocFieldEnum1row?

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The DataContext of your Button should be the instance of the row.

private void buttonClickHandler(object sender, EventArgs e)
{
    Button b = (Button)sender;

    var row = (YourRowType)b.DataContext;
}