Refresh Telerik RadGridView after insert and delete in WPF

How to refresh the datagrid in WPF after some insertion, deletion some process.

<telerik:RadGridView x:Name="RadGridView1"
    ItemsSource="{Binding Data.RouteData, BindsDirectlyToSource=True, Source={StaticResource MasterVMProxy}}"
    SelectedItem="{Binding Data.SelectedRouteInformation, Source={StaticResource MasterVMProxy}}"
    AllowDrop="True" AutoGenerateColumns="False" CanUserDeleteRows="False"
    CanUserInsertRows="False" IsReadOnly="True" RowIndicatorVisibility="Collapsed"
    IsSynchronizedWithCurrentItem="True" SelectionMode="Single"
    ShowGroupPanel="False" Loaded="RadGridView1_Loaded" RowLoaded="RadGridView1_RowLoaded"
    RowDetailsVisibilityChanged="RadGridView1_RowDetailsVisibilityChanged"
    Keyboard.KeyDown="RadGridView1_KeyDown">
     <i:Interaction.Behaviors>
         <local:DragDropCommandBehavior DropCommand="{Binding Data.DropRouteCustomerCommand, Source={StaticResource MasterVMProxy}}" />
     </i:Interaction.Behaviors>
 
     <telerik:RadGridView.Columns>
         <telerik:GridViewToggleRowDetailsColumn Focusable="True"
                                                 ExpandMode="Single"/>
 
         <telerik:GridViewDataColumn UniqueName="RouteNumberRef"
                                 Header="Route"
                                 DataMemberBinding="{Binding Route}" />
 
         <telerik:GridViewDataColumn Header="Route Name"
                                 DataMemberBinding="{Binding RouteDescription}" />
 
         <telerik:GridViewDataColumn Header="Customers on Route"
                                 DataMemberBinding="{Binding CustomerCount}" />
     </telerik:RadGridView.Columns>
     <telerik:RadGridView.RowDetailsTemplate>
         <DataTemplate>
             <Border Style="{StaticResource InnerBorder}"
                 Background="White">
                 <telerik:RadGridView x:Name="RadGridView2"
                                      ItemsSource="{Binding RouteCustomers }"
                                      SelectedItem="{Binding SelectedRouteCustomer, Source={StaticResource MasterVMProxy}}"
                                      AllowDrop="True"
                                      CanUserInsertRows="True"
                                      AutoGenerateColumns="False"
                                      CanUserDeleteRows="False"
                                      CanUserSelect="{Binding Data.CanSelectRouteCustomers, Source={StaticResource MasterVMProxy}}"
                                      EditTriggers="TextInput"
                                      NewRowPosition="Top"
                                      SelectionMode="Single"
                                      ShowGroupPanel="False"
                                      RowIndicatorVisibility="Collapsed"
                                      IsSynchronizedWithCurrentItem="True"
                                      Margin="{StaticResource LeftBottomMargin }"
                                      MaxHeight="420"
                                      RowLoaded ="RadGridView2_RowLoaded"                                                    
                                      Loaded="RadGridView2_Loaded"
                                      SelectionChanging="RadGridView2_SelectionChanging" >