Create form.js

src/mixins/form.js

@@ -0,0 +1,14 @@
+export default {
+    inject: {
+        FormInstance: {
+            default: ''
+        }
+    },
+    computed: {
+        itemDisabled () {
+            let state = this.disabled;
+            if (!state && this.FormInstance) state = this.FormInstance.disabled;
+            return state;
+        }
+    }
+};