First commit

Sample/Editor/GraphAssetEditor.cs

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+using UnityEditor;
+using UnityEditor.Callbacks;
+using UnityEngine;
+
+namespace Misaki.GraphView.Sample.Editor
+{
+    [CustomEditor(typeof(SampleGraphAsset))]
+    public class SampleGraphAssetEditor : UnityEditor.Editor
+    {
+        [OnOpenAsset]
+        public static bool OnOpenAsset(int instanceID, int line)
+        {
+            var asset = EditorUtility.InstanceIDToObject(instanceID) as SampleGraphAsset;
+
+            if (asset != null)
+            {
+                SampleGraphEditor.Open(asset);
+                return true;
+            }
+
+            return false;
+        }
+
+        public override void OnInspectorGUI()
+        {
+            if (GUILayout.Button("Execute"))
+            {
+                var asset = target as SampleGraphAsset;
+                asset?.Execute();
+            }
+        }
+    }
+}