sorting TreeView Hierarchical Data

j'ai
mon treeview :mes je veux trier les fils des noeuds

Code:

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 <sdk:TreeView Canvas.Left="1" Width="556" Name="treeView1" Margin="16,14,0,6" Background="#FFECEEF2" HorizontalContentAlignment="Right" HorizontalAlignment="Left" SelectedItemChanged="treeView1_SelectedItemChanged">
                        <sdk:TreeView.ItemTemplate>
                            <sdk:HierarchicalDataTemplate ItemsSource="{Binding Path=suivi_instruction,Mode=TwoWay}">                           
                                    <sdk:HierarchicalDataTemplate.ItemTemplate>
                                    <DataTemplate>
                                        <StackPanel Orientation="Horizontal">
                                            <TextBlock Text="{Binding Path=x_agent.nom_agent}" FontFamily="Comic Sans MS" Foreground="Orange"/>
                                            <TextBlock Text=" " />
                                            <TextBlock Text="{Binding Path=objet_suivi}" />
                                        </StackPanel>
                                    </DataTemplate>
                                </sdk:HierarchicalDataTemplate.ItemTemplate>
                                <StackPanel Orientation="Horizontal">
                                    <TextBlock Text="{Binding Path=x_agent.nom_agent}" FontFamily="Comic Sans MS" Foreground="Blue" />
                                    <TextBlock Text="   " />
                                    <TextBlock Text="{Binding Path=date}" FontFamily="Comic Sans MS" Foreground="Blue"/>
                                    <TextBlock Text="  : " />
                                    <TextBlock Text="{Binding Path=objet_instruction}" />
                                </StackPanel>
 
                            </sdk:HierarchicalDataTemplate>
                        </sdk:TreeView.ItemTemplate>
                    </sdk:TreeView>

donc je veux faire le trie ici

Code:

<sdk:HierarchicalDataTemplate ItemsSource="{Binding Path=suivi_instruction,Mode=TwoWay}">