diff --git a/tests/Avalonia.Controls.UnitTests/DatePickerTests.cs b/tests/Avalonia.Controls.UnitTests/DatePickerTests.cs
index 3105263290..8271dde3f6 100644
--- a/tests/Avalonia.Controls.UnitTests/DatePickerTests.cs
+++ b/tests/Avalonia.Controls.UnitTests/DatePickerTests.cs
@@ -55,7 +55,7 @@ namespace Avalonia.Controls.UnitTests
 
                 for(int i = 0; i < container.Children.Count; i++)
                 {
-                    if(container.Children[i] is TextBlock tb && tb.Name == "DayText")
+                    if(container.Children[i] is TextBlock tb && tb.Name == "PART_DayTextBlock")
                     {
                         dayText = tb;
                         break;
@@ -93,7 +93,7 @@ namespace Avalonia.Controls.UnitTests
 
                 for (int i = 0; i < container.Children.Count; i++)
                 {
-                    if (container.Children[i] is TextBlock tb && tb.Name == "MonthText")
+                    if (container.Children[i] is TextBlock tb && tb.Name == "PART_MonthTextBlock")
                     {
                         monthText = tb;
                         break;
@@ -131,7 +131,7 @@ namespace Avalonia.Controls.UnitTests
 
                 for (int i = 0; i < container.Children.Count; i++)
                 {
-                    if (container.Children[i] is TextBlock tb && tb.Name == "YearText")
+                    if (container.Children[i] is TextBlock tb && tb.Name == "PART_YearTextBlock")
                     {
                         yearText = tb;
                         break;
@@ -171,15 +171,15 @@ namespace Avalonia.Controls.UnitTests
 
                 for (int i = 0; i < container.Children.Count; i++)
                 {
-                    if (container.Children[i] is TextBlock tb && tb.Name == "YearText")
+                    if (container.Children[i] is TextBlock tb && tb.Name == "PART_YearTextBlock")
                     {
                         yearText = tb;
                     }
-                    else if (container.Children[i] is TextBlock tb1 && tb1.Name == "MonthText")
+                    else if (container.Children[i] is TextBlock tb1 && tb1.Name == "PART_MonthTextBlock")
                     {
                         monthText = tb1;
                     }
-                    else if (container.Children[i] is TextBlock tb2 && tb2.Name == "DayText")
+                    else if (container.Children[i] is TextBlock tb2 && tb2.Name == "PART_DayTextBlock")
                     {
                         dayText = tb2;
                     }
@@ -218,31 +218,31 @@ namespace Avalonia.Controls.UnitTests
                 //Skip contentpresenter
                 var flyoutButton = new Button
                 {
-                    Name = "FlyoutButton"
+                    Name = "PART_FlyoutButton"
                 }.RegisterInNameScope(scope);
                 var contentGrid = new Grid
                 {
-                    Name = "ButtonContentGrid"
+                    Name = "PART_ButtonContentGrid"
                 }.RegisterInNameScope(scope);
                 var dayText = new TextBlock
                 {
-                    Name = "DayText"
+                    Name = "PART_DayTextBlock"
                 }.RegisterInNameScope(scope);
                 var monthText = new TextBlock
                 {
-                    Name = "MonthText"
+                    Name = "PART_MonthTextBlock"
                 }.RegisterInNameScope(scope);
                 var yearText = new TextBlock
                 {
-                    Name = "YearText"
+                    Name = "PART_YearTextBlock"
                 }.RegisterInNameScope(scope);
                 var firstSpacer = new Rectangle
                 {
-                    Name = "FirstSpacer"
+                    Name = "PART_FirstSpacer"
                 }.RegisterInNameScope(scope);
                 var secondSpacer = new Rectangle
                 {
-                    Name = "SecondSpacer"
+                    Name = "PART_SecondSpacer"
                 }.RegisterInNameScope(scope);
                
                 contentGrid.Children.AddRange(new IControl[] { dayText, monthText, yearText, firstSpacer, secondSpacer });
diff --git a/tests/Avalonia.Controls.UnitTests/TimePickerTests.cs b/tests/Avalonia.Controls.UnitTests/TimePickerTests.cs
index c39a963dae..1c2b49dc7d 100644
--- a/tests/Avalonia.Controls.UnitTests/TimePickerTests.cs
+++ b/tests/Avalonia.Controls.UnitTests/TimePickerTests.cs
@@ -114,52 +114,52 @@ namespace Avalonia.Controls.UnitTests
                 //Skip contentpresenter
                 var flyoutButton = new Button
                 {
-                    Name = "FlyoutButton"
+                    Name = "PART_FlyoutButton"
                 }.RegisterInNameScope(scope);
                 var contentGrid = new Grid
                 {
-                    Name = "FlyoutButtonContentGrid"
+                    Name = "PART_FlyoutButtonContentGrid"
                 }.RegisterInNameScope(scope);
 
                 var firstPickerHost = new Border
                 {
-                    Name = "FirstPickerHost",
+                    Name = "PART_FirstPickerHost",
                     Child = new TextBlock
                     {
-                        Name = "HourTextBlock"
+                        Name = "PART_HourTextBlock"
                     }.RegisterInNameScope(scope)
                 }.RegisterInNameScope(scope);
                 Grid.SetColumn(firstPickerHost, 0);
 
                 var secondPickerHost = new Border
                 {
-                    Name = "SecondPickerHost",
+                    Name = "PART_SecondPickerHost",
                     Child = new TextBlock
                     {
-                        Name = "MinuteTextBlock"
+                        Name = "PART_MinuteTextBlock"
                     }.RegisterInNameScope(scope)
                 }.RegisterInNameScope(scope);
                 Grid.SetColumn(secondPickerHost, 2);
 
                 var thirdPickerHost = new Border
                 {
-                    Name = "ThirdPickerHost",
+                    Name = "PART_ThirdPickerHost",
                     Child = new TextBlock
                     {
-                        Name = "PeriodTextBlock"
+                        Name = "PART_PeriodTextBlock"
                     }.RegisterInNameScope(scope)
                 }.RegisterInNameScope(scope);
                 Grid.SetColumn(thirdPickerHost, 4);
 
                 var firstSpacer = new Rectangle
                 {
-                    Name = "FirstColumnDivider"
+                    Name = "PART_FirstColumnDivider"
                 }.RegisterInNameScope(scope);
                 Grid.SetColumn(firstSpacer, 1);
 
                 var secondSpacer = new Rectangle
                 {
-                    Name = "SecondColumnDivider"
+                    Name = "PART_SecondColumnDivider"
                 }.RegisterInNameScope(scope);
                 Grid.SetColumn(secondSpacer, 3);