[Fix] Failing Unit Test in PR MahApps#2710

Author: michaelmairegger

src/MahApps.Metro/MahApps.Metro.Shared/Controls/TimePicker/DateTimePicker.cs

@@ -136,6 +136,7 @@ public override void OnApplyTemplate()
         {
             _calendar = GetTemplateChild(ElementCalendar) as Calendar;
             base.OnApplyTemplate();
+            SetDatePartValues();
         }
 
         protected virtual void OnSelectedDateChanged(TimePickerBaseSelectionChangedEventArgs<DateTime?> e)

src/MahApps.Metro/MahApps.Metro.Shared/Controls/TimePicker/TimePickerBase.cs

@@ -374,16 +374,17 @@ public override void OnApplyTemplate()
             _secondHand = GetTemplateChild(ElementSecondHand) as FrameworkElement;
             _textBox = GetTemplateChild(ElementTextBox) as DatePickerTextBox;
 
-
             SetHandVisibility(HandVisibility);
             SetPickerVisibility(PickerVisibility);
 
+            SetHourPartValues(SelectedTime.GetValueOrDefault());
+            WriteValueToTextBox();
+
             SetDefaultTimeOfDayValues();
             SubscribeEvents();
             ApplyCulture();
             ApplyBindings();
 
-            WriteValueToTextBox();
         }
 
         protected virtual void ApplyBindings()