diff --git a/Assets/FlashTools/Scripts/Internal/Editor/SwfEditorUtils.cs b/Assets/FlashTools/Scripts/Internal/Editor/SwfEditorUtils.cs
new file mode 100644
index 0000000..911e3db
--- /dev/null
+++ b/Assets/FlashTools/Scripts/Internal/Editor/SwfEditorUtils.cs
@@ -0,0 +1,22 @@
+using UnityEngine;
+using UnityEditor;
+
+using System;
+
+namespace FlashTools.Internal {
+	public static class SwfEditorUtils {
+		public static void DoWithMixedValue(bool mixed, Action act) {
+			var last_show_mixed_value = EditorGUI.showMixedValue;
+			EditorGUI.showMixedValue = mixed;
+			act();
+			EditorGUI.showMixedValue = last_show_mixed_value;
+		}
+
+		public static void DoWithEnabledGUI(bool enabled, Action act) {
+			var last_gui_enabled = GUI.enabled;
+			GUI.enabled = enabled;
+			act();
+			GUI.enabled = last_gui_enabled;
+		}
+	}
+}
\ No newline at end of file
diff --git a/Assets/FlashTools/Scripts/Internal/Editor/SwfEditorUtils.cs.meta b/Assets/FlashTools/Scripts/Internal/Editor/SwfEditorUtils.cs.meta
new file mode 100644
index 0000000..10c3dec
--- /dev/null
+++ b/Assets/FlashTools/Scripts/Internal/Editor/SwfEditorUtils.cs.meta
@@ -0,0 +1,12 @@
+fileFormatVersion: 2
+guid: 80bbe5b795df64829b002ddb92fb7a37
+timeCreated: 1472455940
+licenseType: Free
+MonoImporter:
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/Assets/FlashTools/Scripts/Internal/Editor/SwfManagerEditor.cs b/Assets/FlashTools/Scripts/Internal/Editor/SwfManagerEditor.cs
index 6d29fad..1460116 100644
--- a/Assets/FlashTools/Scripts/Internal/Editor/SwfManagerEditor.cs
+++ b/Assets/FlashTools/Scripts/Internal/Editor/SwfManagerEditor.cs
@@ -7,12 +7,11 @@ namespace FlashTools.Internal {
 		SwfManager _manager = null;
 
 		void DrawAnimationCount() {
-			var last_gui_enabled = GUI.enabled;
-			GUI.enabled = false;
-			EditorGUILayout.IntField(
-				"Animation count",
-				_manager.AllAnimationCount);
-			GUI.enabled = last_gui_enabled;
+			SwfEditorUtils.DoWithEnabledGUI(false, () => {
+				EditorGUILayout.IntField(
+					"Animation count",
+					_manager.AllAnimationCount);
+			});
 		}
 
 		// ---------------------------------------------------------------------
diff --git a/Assets/FlashTools/Scripts/Internal/Editor/SwfPropertyDrawers.cs b/Assets/FlashTools/Scripts/Internal/Editor/SwfPropertyDrawers.cs
index cf93a8d..1b2d406 100644
--- a/Assets/FlashTools/Scripts/Internal/Editor/SwfPropertyDrawers.cs
+++ b/Assets/FlashTools/Scripts/Internal/Editor/SwfPropertyDrawers.cs
@@ -110,36 +110,31 @@ namespace FlashTools.Internal.SwfEditorTools {
 			}
 		}
 
-		static void DoWithMixedValue(bool mixed, Action act) {
-			var last_show_mixed_value = EditorGUI.showMixedValue;
-			EditorGUI.showMixedValue = mixed;
-			act();
-			EditorGUI.showMixedValue = last_show_mixed_value;
-		}
-
 		public override void OnGUI(
 			Rect position, SerializedProperty property, GUIContent label)
 		{
 			if ( property.propertyType == SerializedPropertyType.String ) {
 				ValidateProperty(property);
-				DoWithMixedValue(property.hasMultipleDifferentValues, () => {
-					var all_sorting_layers  = GetAllSortingLayers(true);
-					var sorting_layer_index = EditorGUI.Popup(
-						position,
-						label,
-						property.hasMultipleDifferentValues
-							? all_sorting_layers.FindIndex(p => string.IsNullOrEmpty(p))
-							: all_sorting_layers.FindIndex(p => p == property.stringValue),
-						all_sorting_layers.Select(p => new GUIContent(p)).ToArray());
-					var new_value = all_sorting_layers[sorting_layer_index];
-					if ( !string.IsNullOrEmpty(new_value) ) {
-						if ( property.hasMultipleDifferentValues ) {
-							property.stringValue = string.Empty;
+				SwfEditorUtils.DoWithMixedValue(
+					property.hasMultipleDifferentValues, () =>
+					{
+						var all_sorting_layers  = GetAllSortingLayers(true);
+						var sorting_layer_index = EditorGUI.Popup(
+							position,
+							label,
+							property.hasMultipleDifferentValues
+								? all_sorting_layers.FindIndex(p => string.IsNullOrEmpty(p))
+								: all_sorting_layers.FindIndex(p => p == property.stringValue),
+							all_sorting_layers.Select(p => new GUIContent(p)).ToArray());
+						var new_value = all_sorting_layers[sorting_layer_index];
+						if ( !string.IsNullOrEmpty(new_value) ) {
+							if ( property.hasMultipleDifferentValues ) {
+								property.stringValue = string.Empty;
+							}
+							property.stringValue = new_value;
+							property.serializedObject.ApplyModifiedProperties();
 						}
-						property.stringValue = new_value;
-						property.serializedObject.ApplyModifiedProperties();
-					}
-				});
+					});
 			} else {
 				EditorGUI.LabelField(position, label.text, "Use SwfSortingLayer with string attribute.");
 			}
@@ -194,13 +189,6 @@ namespace FlashTools.Internal.SwfEditorTools {
 			}
 		}
 
-		static void DoWithMixedValue(bool mixed, Action act) {
-			var last_show_mixed_value = EditorGUI.showMixedValue;
-			EditorGUI.showMixedValue = mixed;
-			act();
-			EditorGUI.showMixedValue = last_show_mixed_value;
-		}
-
 		public override void OnGUI(
 			Rect position, SerializedProperty property, GUIContent label)
 		{
@@ -209,15 +197,17 @@ namespace FlashTools.Internal.SwfEditorTools {
 				var bool_prop = FindNextBoolProperty(property, attr.BoolProp);
 				var need_pow2 = (bool_prop != null && (bool_prop.boolValue || bool_prop.hasMultipleDifferentValues));
 				ValidateProperty(property, need_pow2, attr.MinPow2, attr.MaxPow2);
-				DoWithMixedValue(property.hasMultipleDifferentValues, () => {
-					if ( need_pow2 ) {
-						var values = GenPowerOfTwoValues(attr.MinPow2, attr.MaxPow2);
-						var vnames = values.Select(p => new GUIContent(p.ToString())).ToArray();
-						EditorGUI.IntPopup(position, property, vnames, values, label);
-					} else {
-						EditorGUI.PropertyField(position, property, label, true);
-					}
-				});
+				SwfEditorUtils.DoWithMixedValue(
+					property.hasMultipleDifferentValues, () =>
+					{
+						if ( need_pow2 ) {
+							var values = GenPowerOfTwoValues(attr.MinPow2, attr.MaxPow2);
+							var vnames = values.Select(p => new GUIContent(p.ToString())).ToArray();
+							EditorGUI.IntPopup(position, property, vnames, values, label);
+						} else {
+							EditorGUI.PropertyField(position, property, label, true);
+						}
+					});
 			} else {
 				EditorGUI.LabelField(position, label.text, "Use SwfPowerOfTwoIf with integer attribute.");
 			}
diff --git a/Assets/FlashTools/Scripts/SwfManager.cs b/Assets/FlashTools/Scripts/SwfManager.cs
index 4f32de5..3d4108c 100644
--- a/Assets/FlashTools/Scripts/SwfManager.cs
+++ b/Assets/FlashTools/Scripts/SwfManager.cs
@@ -8,11 +8,6 @@ using UnityEditor;
 namespace FlashTools {
 	[ExecuteInEditMode, DisallowMultipleComponent]
 	public class SwfManager : MonoBehaviour {
-		// ---------------------------------------------------------------------
-		//
-		// Properties
-		//
-		// ---------------------------------------------------------------------
 
 		HashSet<SwfAnimation>           _animations  = new HashSet<SwfAnimation>();
 		HashSet<SwfAnimationController> _controllers = new HashSet<SwfAnimationController>();