tree view

      <TreeView x:Name="treeParameter"
           
                     Width="350" MinHeight="300" 
              Margin="11,6,11,6"
              ItemsSource="{Binding ItemSource}">
                    <TreeView.ItemContainerStyle>
                        <Style TargetType="{x:Type TreeViewItem}">
                            <Setter Property="IsSelected" Value="{Binding IsSelected, Mode=TwoWay}" />
                            <Setter Property="FontWeight" Value="Normal" />
                            <Setter Property="Foreground" Value="#0c223a"></Setter>
                            <Setter Property="FontSize" Value="14"></Setter>
                            <Setter Property="FontFamily" Value="Arial"></Setter>
                            <Setter Property="Margin" Value="0,3,0,3"></Setter>
                            <Setter Property="Background" Value="Transparent"></Setter>
                            <Style.Triggers>
                                <Trigger Property="IsSelected" Value="True">
                                    <Setter Property="FontWeight" Value="Bold" />
                                </Trigger>
                            </Style.Triggers>
                        </Style>
                    </TreeView.ItemContainerStyle>
                    <Event:Interaction.Triggers>
                        <Event:EventTrigger EventName="SelectedItemChanged" SourceName="treeParameter">
                            <Event:InvokeCommandAction Command="{Binding SelectedChangedCommand}"
                                               CommandParameter="{Binding ElementName=treeParameter,Path=SelectedItem}">
                            </Event:InvokeCommandAction>
                        </Event:EventTrigger>
                    </Event:Interaction.Triggers>
                    <TreeView.ItemTemplate>
                        <HierarchicalDataTemplate ItemsSource="{Binding ChildNodes,Mode=TwoWay}">
                            <TextBlock Text="{Binding ParameterName, Mode=TwoWay}" />
                        </HierarchicalDataTemplate>
                    </TreeView.ItemTemplate>
                </TreeView>