How to set the Tick frequency in the SfRadialSlider?

<Page
x:Class="WinRT_KB_Application.MainPage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:WinRT_KB_Application"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:navigation="using:Syncfusion.UI.Xaml.Controls.Navigation"
mc:Ignorable="d">
<Grid x:Name="Grid1" Background="{StaticResource ApplicationPageBackgroundThemeBrush}" >
<navigation:SfRadialSlider x:Name="_Radial" Minimum="0" Maximum="100" TickFrequency="5"/>
</Grid>
</Page>

using Syncfusion.UI.Xaml.Controls;
using Windows.UI;
// The Blank Page item template is documented at http://go.microsoft.com/fwlink/?LinkId=234238
namespace WinRT_KB_Application
{
/// <summary>
/// An empty page that can be used on its own or navigated to within a Frame.
/// </summary>
public sealed partial class MainPage : Page
{
public MainPage()
{
this.InitializeComponent();
 
SfRadialSlider _Radial = new SfRadialSlider();
_Radial.Minimum = 0;
_Radial.Maximum = 100;
_Radial.TickFrequency = 5;
Grid1.Children.Add(_Radial);
}
/// <summary>
/// Invoked when this page is about to be displayed in a Frame.
/// </summary>
/// <param name="e">Event data that describes how this page was reached.  The Parameter
/// property is typically used to configure the page.</param>
protected override void OnNavigatedTo(NavigationEventArgs e)
{
}
}
}