✅ WPF - Accessing a TreeViewItem's root UserControl DataContext for a Command

<StackPanel.ContextMenu>
    <ContextMenu Style="{StaticResource ContextMenu}">
        <MenuItem Header="Delete Gist" Background="{DynamicResource {x:Static vsshell:VsBrushes.WindowKey}}"
                  Style="{StaticResource MenuItem}" 
                  Command="{Binding 
                        RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type viewmodels:MainWindowViewModel}},
                        Path=DataContext.DeleteGistCMD}">
            <MenuItem.Icon>
                <imaging:CrispImage Moniker="{x:Static catalog:KnownMonikers.DeleteListItem}"/>
            </MenuItem.Icon>
        </MenuItem>
    </ContextMenu>
</StackPanel.ContextMenu>