How to add a new button near Done and Cancel buttons in SfTimeSelector?

<Grid
 
<syncfusion:SfDatePicker HorizontalAlignment="Left" Name="datePicker"                 
                         Loaded="datePicker_Loaded"/>
 
<syncfusion:SfTimePicker HorizontalAlignment="Right" Name="TimePicker" 
                         Loaded="TimePicker_Loaded"/>
</Grid>
 

public sealed partial class MainPage : Page
{
        //private object dropdownpopup_Opened;
  public MainPage()
  {
    this.InitializeComponent();
  }
 
  Popup dropdownPopup = null;
  Popup timepickerdropdownPopup = null;
  public static IEnumerable<T> FindVisualChildrenOfType<T>(DependencyObject parent)
  where T : DependencyObject
  {
     List<T> foundChildren = new List<T>();
     int childCount = VisualTreeHelper.GetChildrenCount(parent);
     for (int i = 0; i < childCount; i++)
     {
       var child = VisualTreeHelper.GetChild(parent, i);
       T childType = child as T;
       if (childType == null)
       {
         foreach (var other in FindVisualChildrenOfType<T>(child))
         yield return other;
       }
       else
       {
         yield return (T)child;
       }
      }
    }
 
    private void datePicker_Loaded(object sender, RoutedEventArgs e)
    {
     if (datePicker != null)
     {
       foreach (Popup popup in FindVisualChildrenOfType<Popup>(datePicker))
       {
         if (popup != null && popup.Name == "PART_DropDown")
         {
           dropdownPopup = popup;
           dropdownPopup.Opened += dropdownpopup_Opened;
          }
        }
       }
      }
 
      private void TimePicker_Loaded(object sender, RoutedEventArgs e)
      {
        if (TimePicker != null)
        {
          foreach (Popup popup in FindVisualChildrenOfType<Popup>(TimePicker))
          {
           if (popup != null && popup.Name == "PART_DropDown")
           {
             timepickerdropdownPopup = popup;
             timepickerdropdownPopup.Opened += dropdownpopup_Opened;
           }
          }
        }
       }
 
       private void dropdownpopup_Opened(object sender, object e)
       {
         if (dropdownPopup != null && dropdownPopup.Child != null && 
             dropdownPopup.Child is Grid && 
            (dropdownPopup.Child as Grid).Children.Count > 0)
         {
           SfDateSelector selector = null;
           SfTimeSelector timeselector = null;
           foreach (var child in (dropdownPopup.Child as Grid).Children)
           {
            if (child is SfDateSelector selector = child as SfDateSelector;
               if (selector != null)
                 break;
           }
           foreach (var child in (timepickerdropdownPopup.Child as Grid).Children)
           {
            if (child is SfTimeSelector) timeselector = child as SfTimeSelector;
               if (timeselector != null)
                break;
            }
            if (selector != null)
            {
              selector.Style = Application.Current.Resources["dateselectorstyle"] as    
                               Style;
            }
            if (timeselector != null)
            timeselector.Style = Application.Current.Resources["timeselectorstyle"] as 
                                Style;
          }
        }
    }