WPF - MVVM Treeview get selected item [duplicate] - wpf

This question already has answers here:
Data binding to SelectedItem in a WPF Treeview
(21 answers)
Closed 6 years ago.
‘SelectedItem’ property is read-only and cannot be set from markup. How i can get selected item?
<TreeView x:Name="TreeView1"
ItemsSource="{Binding Path=Champ}">
<TreeView.Resources>
<HierarchicalDataTemplate DataType="{x:Type self:SimpleChampionship}" ItemsSource="{Binding Path=Tours}">
<StackPanel Orientation="Horizontal">
<TextBlock Text="{Binding Path=Name}" />
</StackPanel>
</HierarchicalDataTemplate>
<HierarchicalDataTemplate DataType="{x:Type self:SimpleTourClient}" ItemsSource="{Binding Path=Matches}">
<StackPanel Orientation="Horizontal" >
<TextBlock Text="Tour:" />
<TextBlock Text="{Binding Path=NameTour}" />
<TextBlock Text=" Matches [" />
<TextBlock Text="{Binding Path=Matches.Count}" />
<TextBlock Text="]" />
</StackPanel>
</HierarchicalDataTemplate>
<HierarchicalDataTemplate DataType="{x:Type self:SimpleMatchClient}">
<StackPanel Orientation="Horizontal" >
<TextBlock Text="{Binding Path=Home}" />
<TextBlock Text="{Binding Path=HomeTeamGoals}" />
<TextBlock Text=" - " />
<TextBlock Text="{Binding Path=GuestTeamGoals}" />
<TextBlock Text="{Binding Path=Guest}" />
</StackPanel>
</HierarchicalDataTemplate>
</TreeView.Resources>
</TreeView>
example treeview
Need return selected SimpleMatchClient


Try this. It should work.
var treeViewItem = TreeView1.ItemContainerGenerator.ContainerFromItem(SelectedItem) as TreeViewItem;

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<TreeView Name="trvFamilies" HorizontalAlignment="Left" Margin="10,10,3,3" Width="340">
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<HierarchicalDataTemplate DataType="{x:Type self:Scene}" ItemsSource="{Binding Characters}">
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</TreeView.Resources>
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