Create a shared project with all Win App common files (8.1 and 10)

Finally use the dependency injected Resource Service

WinAppCommon/Events/PasswordEventArgs.cs

@@ -0,0 +1,14 @@
+using System;
+
+namespace ModernKeePass.Events
+{
+    public class PasswordEventArgs: EventArgs
+    {
+        public string RootGroupId { get; set; }
+
+        public PasswordEventArgs(string groupId)
+        {
+            RootGroupId = groupId;
+        }
+    }
+}