Updated PropertyDrawer;

Updated MaterialUIScope;

Editor/MaterialUIScope.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.Collections.ObjectModel;
 using System.Linq;
 using UnityEditor;
 using UnityEditor.Rendering;
@@ -12,6 +13,7 @@ namespace Misaki.ShaderGUI
         protected MaterialEditor editor;
         protected IEnumerable<MaterialProperty> materialProperties;
         protected IMaterialUIScopeContainer owner;
+        protected ReadOnlyCollection<Material> materials;
 
         protected virtual bool ShowSection => true;
         protected virtual bool IsSubHeader => false;
@@ -39,6 +41,7 @@ namespace Misaki.ShaderGUI
             editor = materialEditor;
             materialProperties = properties;
             owner = container;
+            materials = editor.GetMaterials().ToList().AsReadOnly();
 
             UpdateMaterialProperties(properties);
         }