How to get a value from treeview.

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WPF

MVVM

Hello!
I have a treeview:

<TreeView  
    BorderBrush="Black" 
    BorderThickness="2" 
    Cursor="Hand" 
    ItemsSource="{Binding Data, UpdateSourceTrigger=PropertyChanged}" >
    <TreeView.ItemContainerStyle>
	<Style TargetType="{x:Type TreeViewItem}">
		<Setter 
                    Property="IsSelected" 
                    Value="{Binding SelectedPath, Mode=TwoWay}" />
		</Style>
    </TreeView.ItemContainerStyle>
    <TreeView.ItemTemplate>
        <HierarchicalDataTemplate 
            ItemsSource="{
                            Binding Persons, 
                            UpdateSourceTrigger=PropertyChanged}" 
            DataType="{x:Type local:Data}" >
            <Grid>
		<StackPanel Orientation="Horizontal">
    		<TextBlock x:Name="dane" Text="{Binding ID}" Margin="0,0,5,0" />
                <Button 
                    Style="{StaticResource ButtonLikeTextBlock}" 
                    Content="{Binding DataOrName}" 
                    Command="
                            {Binding 
                                    Path=DataContext.DisplayInfoCommand, 
                                    RelativeSource = {RelativeSource FindAncestor, AncestorType={x:Type Window}}}" />
								
		</StackPanel>
            </Grid>
        </HierarchicalDataTemplate>
    </TreeView.ItemTemplate>
</TreeView>

How can i get the ID property which is in Persons list ? How can i bind it straight to viewmodel class? Can u show sample code?

Greetings, Boryborawski.