How can I show RadialMenu over TileViewItem

Hi~

I want to show RadialMenu over TileViewItem.

TileViewItem hide RadialMenu.

Here is example code.

<Window x:Class="TileView.MainWindow"
                xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation"
                xmlns:tileView="clr-namespace:Telerik.Windows.Controls.TileView;assembly=Telerik.Windows.Controls.Navigation"
                Title="MainWindow" Height="350" Width="525">

    <Window.Resources>
        <Style TargetType="telerik:RadTileView">
            <Setter Property="PreservePositionWhenMaximized" Value="True" />
            <Setter Property="telerik:TileViewPanel.IsVirtualized" Value="True" />
            <Setter Property="IsAutoScrollingEnabled" Value="True" />
            <Setter Property="TileStateChangeTrigger" Value="SingleClick" />
            <Setter Property="MinimizedColumnWidth" Value="180" />
            <Setter Property="MinimizedRowHeight" Value="155" />
            <Setter Property="RowHeight" Value="250" />
            <Setter Property="ColumnWidth" Value="250" />
            <Setter Property="ColumnsCount" Value="3" />
        </Style>
        <Style TargetType="telerik:RadTileViewItem">
            <Setter Property="Background" Value="#eaeaea" />
        </Style>
        <DataTemplate x:Key="sizeTemplate">
            <StackPanel Orientation="Horizontal">
                <TextBlock Text="Item" />
                <TextBlock Text="{Binding}" />
            </StackPanel>
        </DataTemplate>
        <DataTemplate x:Key="contentTemplate">
            <StackPanel>
                <telerik:RadRadialMenu Panel.ZIndex="99999">
                    <telerik:RadRadialMenuItem Header="Item 1" />
                    <telerik:RadRadialMenuItem Header="Item 2" />
                    <telerik:RadRadialMenuItem Header="Item 3" />
                </telerik:RadRadialMenu>
            </StackPanel>
        </DataTemplate>
    </Window.Resources>
    
    <Grid>
       
        <telerik:RadTileView  ItemsSource="{Binding}" ItemTemplate="{StaticResource sizeTemplate}"
                              ContentTemplate="{StaticResource contentTemplate}"  />
    </Grid>
</Window>

You can see capture file "Actual.png"

I want to "Expect.png" screen.

How?