Adjust project structure

src/Shared/HandyControl_Shared/Tools/Helper/SecurityHelper.cs

@@ -0,0 +1,22 @@
+using System.Diagnostics.CodeAnalysis;
+using System.Security;
+using System.Security.Permissions;
+
+namespace HandyControl.Tools
+{
+    [SuppressMessage("ReSharper", "InconsistentNaming")]
+    internal class SecurityHelper
+    {
+        private static UIPermission _allWindowsUIPermission;
+
+        [SecurityCritical]
+        internal static void DemandUIWindowPermission()
+        {
+            if (_allWindowsUIPermission == null)
+            {
+                _allWindowsUIPermission = new UIPermission(UIPermissionWindow.AllWindows);
+            }
+            _allWindowsUIPermission.Demand();
+        }
+    }
+}