diff --git a/FasdDesktopUi/Basics/UserControls/Ticket/CloseCaseDialogWithTicket.xaml.cs b/FasdDesktopUi/Basics/UserControls/Ticket/CloseCaseDialogWithTicket.xaml.cs
index aff5b33..2860741 100644
--- a/FasdDesktopUi/Basics/UserControls/Ticket/CloseCaseDialogWithTicket.xaml.cs
+++ b/FasdDesktopUi/Basics/UserControls/Ticket/CloseCaseDialogWithTicket.xaml.cs
@@ -71,12 +71,21 @@ namespace FasdDesktopUi.Basics.UserControls
         private const string CategoryTableNameLegacy = "M42Wpm-Ticket-CloseCase-Categories";
         private string activeCategoryTableName = CategoryTableNamePrimary;
 
+        private static readonly Brush SharedValidationBorderBrush = CreateValidationBrush();
+        private static Brush CreateValidationBrush()
+        {
+            var brush = new SolidColorBrush(Color.FromRgb(0xF5, 0x7C, 0x73));
+            if (brush.CanFreeze)
+                brush.Freeze();
+            return brush;
+        }
+
         private ObservableCollection<HierarchicalSelectionItem> categoryHierarchy = new ObservableCollection<HierarchicalSelectionItem>();
         private readonly Dictionary<string, HierarchicalSelectionItem> categoryLookup = new Dictionary<string, HierarchicalSelectionItem>(StringComparer.OrdinalIgnoreCase);
         private bool isCategoryLoading;
         private Brush defaultCategoryBorderBrush;
         private Brush defaultQuickTicketBorderBrush;
-        private readonly Brush validationErrorBrush = new SolidColorBrush(Colors.Red);
+        private readonly Brush validationErrorBrush = SharedValidationBorderBrush;
         private Brush defaultTicketStatusBorderBrush;
 
         public bool IsTicket
@@ -2198,9 +2207,9 @@ namespace FasdDesktopUi.Basics.UserControls
             }
             else
             {
-                CaseNotesPreviewBorder.BorderBrush = new SolidColorBrush(Colors.Red);
-            }
-        }
+                CaseNotesPreviewBorder.BorderBrush = SharedValidationBorderBrush;
+            }
+        }
 
         private void EditCaseNotesButton_TouchDown(object sender, TouchEventArgs e)
         {
@@ -2336,7 +2345,7 @@ namespace FasdDesktopUi.Basics.UserControls
             //    if (selectedItem.Tag == null)
             //    {
             //        // Setze die Hintergrundfarbe auf Rot, um einen Validierungsfehler anzuzeigen
-            //        comboBox.BorderBrush = new SolidColorBrush(Colors.Red);
+            //        comboBox.BorderBrush = SharedValidationBorderBrush;
             //    }
             //    else
             //    {
@@ -2416,7 +2425,7 @@ namespace FasdDesktopUi.Basics.UserControls
                 if (string.IsNullOrWhiteSpace(text))
                 {
                     // Setze die Hintergrundfarbe auf Rot, um einen Validierungsfehler anzuzeigen
-                    textBox.BorderBrush = new SolidColorBrush(Colors.Red);
+                    textBox.BorderBrush = SharedValidationBorderBrush;
                 }
                 else
                 {
@@ -2434,7 +2443,7 @@ namespace FasdDesktopUi.Basics.UserControls
             if (notEmpty && string.IsNullOrWhiteSpace(_textBlock.Text))
             {
                 _retVal = true;
-                _borderCaseNores = new SolidColorBrush(Colors.Red);
+                _borderCaseNores = SharedValidationBorderBrush;
             }
             CaseNotesPreviewBorder.BorderBrush = _borderCaseNores;
             return _retVal;
@@ -2449,7 +2458,7 @@ namespace FasdDesktopUi.Basics.UserControls
                 if (hasError)
                 {
                     // Setze die Hintergrundfarbe auf Rot, um einen Validierungsfehler anzuzeigen
-                    textBox.BorderBrush = new SolidColorBrush(Colors.Red);
+                    textBox.BorderBrush = SharedValidationBorderBrush;
                 }
                 else
                 {