How to achieve hierarchy view in list view WPF ?

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C#

XAML

WPF

my list view contains 2 GridViewColumn one is a category and another one is extension
in the category need to have parent like eg Application in those child contains NotePad,VLC etc in the extension it contains .exe like the same next parent in down need to be like Audio in those child contains all the audio files how to achiever those things soory if i am not asked clearly

What I have tried:

<ListView x:Name="ListViewSetting" BorderBrush="#efefef" Width="650" Height="310" ItemsSource="{Binding ChildrenList}" Background="#F9F9F9" >
                       <ListView.View>
                           <GridView>

                               <GridViewColumn  CellTemplate="{StaticResource myCellTemplateMonth}"  Width="400" >
                                   <GridViewColumn.Header  >
                                       <GridViewColumnHeader  Template="{StaticResource CustomHeaderForName}" Margin="-3,0,0,0" Tag="Category"   BorderThickness="0"  Width="auto" Height="40"  />
                                   </GridViewColumn.Header>
                               </GridViewColumn>

                               <GridViewColumn  CellTemplate="{StaticResource myCellTemplateSize}" Width="260" >
                                   <GridViewColumn.Header  >


                                       <GridViewColumnHeader Margin="0,0,0,0"  Tag="File extension" Template="{StaticResource CustomHeader}"  BorderThickness="0"  Width="auto" Height="40" />


                                   </GridViewColumn.Header>
                               </GridViewColumn>

                           </GridView>
                       </ListView.View>

                       <ListView.GroupStyle>
                           <GroupStyle>
                               <GroupStyle.HeaderTemplate>
                                   <DataTemplate>
                                       <TextBlock  FontSize="20" FontWeight="Bold" Text="{Binding FileName}"  >  </TextBlock>
                                   </DataTemplate>
                               </GroupStyle.HeaderTemplate>
                           </GroupStyle>
                       </ListView.GroupStyle>
                   </ListView>