How to set the focused background and foreground color in WPF UpDown?

//Code Explains How to set the FocusBackground and FocusForeground color in UpDown
<Grid>
     <syncfusion:UpDown Name="UpDown" Width="150" Height="70" EnableFocusedColors="True" FocusedBackground="Yellow" FocusedForeground="Red"></syncfusion:UpDown>
</Grid>

//Code Explains How to set the FocusBackground and FocusForeground color in UpDown
namespace UpDown
{
   public partial class MainWindow : Window
   {
      public MainWindow()
      {
         InitializeComponent();
         UpDown.EnableFocusedColors = true;
         UpDown.FocusedBackground = Brushes.Yellow;
         UpDown.FocusedForeground = Brushes.Red;
      }
   }
}