bugfix dropdown closing by ESC

FasdDesktopUi/Pages/TicketCompletion/TicketCompletion.xaml.cs

@@ -280,21 +280,15 @@ namespace FasdDesktopUi.Pages.TicketCompletion
 
         #endregion
 
-        private void CustomMessageBox_PreviewKeyDown(object sender, KeyEventArgs e)
+        private void CustomMessageBox_KeyDown(object sender, KeyEventArgs e)
         {
-            switch (e.Key)
+            if (e.Key != Key.Escape)
             {
-                case Key.Escape:
-                    if (CloseCaseDialogUc?.TryHandleEscapeKey() == true)
-                    {
-                        e.Handled = true;
-                        return;
-                    }
-
-                    Close_Click();
-                    e.Handled = true;
-                    break;
+                return;
             }
+
+            Close_Click();
+            e.Handled = true;
         }
 
         private async Task DoCloseActionAsync()