Added project

Platformer/Assets/Editor/ItemBaseEditor.cs

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+using UnityEditor;
+using UnityEngine;
+
+[CustomEditor(typeof(ItemBase))]
+public class ItemBaseEditor : Editor {
+
+    private ItemBase _itemBase;
+
+    private void Awake() {
+        _itemBase = (ItemBase) target;
+    }
+
+    public override void OnInspectorGUI() {
+        GUILayout.BeginHorizontal();
+        if (GUILayout.Button("New Item")) {
+            _itemBase.CreateItem();
+        }
+        if (GUILayout.Button("Remove")) {
+            _itemBase.RemoveItem();
+        }
+        if (GUILayout.Button("<=")) {
+            _itemBase.PrevItem();
+        }
+        if (GUILayout.Button("=>")) {
+            _itemBase.NextItem();
+        }
+        GUILayout.EndHorizontal();
+        base.OnInspectorGUI();
+    }
+}

Platformer/Assets/Editor/ItemBaseEditor.cs.meta

@@ -0,0 +1,11 @@
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+  defaultReferences: []
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