Abnormal Listbox drag indicator

[David Yeung]

As image attached ,when item is dragged for reorder,drag indicator is cover whole column(as red box shown) but not specific column and row(as green box shown).Is there are some workaround to fix that? 

<Window.Resources>
        <Style x:Key="DraggableListBoxItem" TargetType="telerik:RadListBoxItem">
            <Setter Property="telerik:DragDropManager.AllowCapturedDrag" Value="True"/>
        </Style>
    </Window.Resources>


<telerik:RadListBox x:Name="scanList" KeyboardNavigation.DirectionalNavigation="None" KeyboardNavigation.AcceptsReturn="False" ItemsSource="{Binding Path=Scans,Mode=TwoWay}" SelectionMode="Multiple"  ScrollViewer.VerticalScrollBarVisibility="Hidden" ScrollViewer.HorizontalScrollBarVisibility="Disabled" CanKeyboardNavigationSelectItems="False" ItemContainerStyle="{StaticResource DraggableListBoxItem}">
        <telerik:RadListBox.DragDropBehavior>
            <telerik:ListBoxDragDropBehavior telerik:TouchManager.DragStartTrigger="TouchMove"/>
        </telerik:RadListBox.DragDropBehavior>

        <telerik:RadListBox.ItemsPanel>
            <ItemsPanelTemplate>
                <telerik:VirtualizingWrapPanel/>
            </ItemsPanelTemplate>
        </telerik:RadListBox.ItemsPanel>

        <telerik:RadListBox.ItemTemplate>
            <DataTemplate>
                <Grid>
                    <Image Source="test.jpg" HorizontalAlignment="Center" VerticalAlignment="Center"/>
                    <Image HorizontalAlignment="Left" Margin="10,10,0,0" VerticalAlignment="Top" Width="48" Height="48" Opacity="0.15" Source="/ePresort;component/Icon/edit.png" />
                    <Label Content="{Binding Path=ScanId,Mode=TwoWay}"/>
                </Grid>
            </DataTemplate>
        </telerik:RadListBox.ItemTemplate>

    </telerik:RadListBox>

PS: ItemHeight and ItemWidth of VirtualizingWrapPanel is set by C# code