diff --git a/djx/src/main/ts/tsx.ts b/djx/src/main/ts/tsx.ts
--- a/djx/src/main/ts/tsx.ts
+++ b/djx/src/main/ts/tsx.ts
@@ -1,8 +1,11 @@
-import { Constructor } from "@implab/core-amd/interfaces";
+import { Constructor, IDestroyable, IRemovable } from "@implab/core-amd/interfaces";
 import { HtmlRendition } from "./tsx/HtmlRendition";
 import { WidgetRendition } from "./tsx/WidgetRendition";
-import { isWidgetConstructor, Rendition } from "./tsx/traits";
+import { destroy, isWidgetConstructor, Rendition } from "./tsx/traits";
 import { FunctionRendition } from "./tsx/FunctionRendition";
+import Stateful = require("dojo/Stateful");
+import _WidgetBase = require("dijit/_WidgetBase");
+import { DjxWidgetBase } from "./tsx/DjxWidgetBase";
 
 export function createElement<T extends Constructor | string | ((props: any) => Element)>(elementType: T, ...args: any[]): Rendition {
     if (typeof elementType === "string") {
@@ -38,3 +41,79 @@ export interface EventSelector {
 }
 
 export type DojoMouseEvent<T = any> = MouseEvent & EventSelector & EventDetails<T>;
+
+type StatefulProps<T> = T extends Stateful<infer A> ? A : never;
+
+type CleanFn = (instance: IRemovable | IDestroyable) => void;
+
+/**
+ * Observers the property and calls render callback each change.
+ *
+ * @param target The target object which property will be observed.
+ * @param prop The name of the property.
+ * @param render The callback which will be called every time the value is changed
+ * @param cleanupOrOwner The object with method `own` or an callback to register lifecycle for the observer.
+ * @returns Rendition which is created instantly
+ */
+export function watch<W extends _WidgetBase, K extends keyof W>(
+    target: W,
+    prop: K,
+    render: (model: W[K]) => any,
+    cleanupOrOwner?: { own: CleanFn } | CleanFn
+): Rendition;
+/**
+ * Observers the property and calls render callback each change.
+ *
+ * @param target The target object which property will be observed.
+ * @param prop The name of the property.
+ * @param render The callback which will be called every time the value is changed
+ * @param cleanupOrOwner The object with method `own` or an callback to register lifecycle for the observer.
+ * @returns Rendition which is created instantly
+ */
+export function watch<T extends Stateful, K extends keyof StatefulProps<T>>(
+    target: T,
+    prop: K,
+    render: (model: StatefulProps<T>[K]) => any,
+    cleanupOrOwner?: { own: CleanFn } | CleanFn
+): Rendition;
+export function watch<T extends Stateful, K extends keyof StatefulProps<T> & string>(
+    target: T,
+    prop: K,
+    render: (model: StatefulProps<T>[K]) => any,
+    cleanupOrOwner: { own: CleanFn } | CleanFn = () => { }
+) {
+    let rendition = new FunctionRendition(() => render(target.get(prop)));
+    const _own = cleanupOrOwner instanceof Function ? cleanupOrOwner : (x: IRemovable) => cleanupOrOwner.own(x);
+    _own(target.watch(prop, (_name, oldValue, newValue) => {
+        if (oldValue !== newValue) {
+            const newRendition = new FunctionRendition(() => render(newValue));
+            newRendition.placeAt(rendition.getDomNode(), "replace");
+            destroy(rendition.getDomNode());
+            rendition = newRendition;
+        }
+    }));
+    return rendition;
+}
+
+/** Decorates the method which will be registered as the handle for the specified event.
+ * This decorator can be applied to DjxWidgetBase subclass methods.
+ *
+ * ```
+ *  @on("click")
+ *  _onClick(eventObj: MouseEvent) {
+ *      // ...
+ *  }
+ * ```
+ */
+export const on = <E extends string>(...eventNames: E[]) =>
+    <K extends string,
+        T extends DjxWidgetBase<any, { [p in E]: EV }>,
+        EV extends Event
+    >(
+        target: T,
+        key: K,
+        _descriptor: TypedPropertyDescriptor<(eventObj: EV) => void> | TypedPropertyDescriptor<() => void>
+    ): any => {
+        const handlers = eventNames.map(eventName => ({ eventName, handlerMethod: key }))
+        target._eventHandlers = target._eventHandlers ? target._eventHandlers.concat(handlers) : handlers;
+    };
diff --git a/djx/src/main/ts/tsx/traits.ts b/djx/src/main/ts/tsx/traits.ts
--- a/djx/src/main/ts/tsx/traits.ts
+++ b/djx/src/main/ts/tsx/traits.ts
@@ -1,11 +1,8 @@
-import { IDestroyable, IRemovable } from "@implab/core-amd/interfaces";
+import { IDestroyable } from "@implab/core-amd/interfaces";
 import { isDestroyable } from "@implab/core-amd/safe";
 import _WidgetBase = require("dijit/_WidgetBase");
 import registry = require("dijit/registry");
 import dom = require("dojo/dom-construct");
-import Stateful = require("dojo/Stateful");
-import { FunctionRendition } from "./FunctionRendition";
-import { DjxWidgetBase } from "./DjxWidgetBase";
 
 type _WidgetBaseConstructor = typeof _WidgetBase;
 
@@ -149,80 +146,3 @@ export function startupWidgets(target: N
             target.startup();
     }
 }
-
-
-type StatefulProps<T> = T extends Stateful<infer A> ? A : never;
-
-type CleanFn = (instance: IRemovable | IDestroyable) => void;
-
-/**
- * Observers the property and calls render callback each change.
- *
- * @param target The target object which property will be observed.
- * @param prop The name of the property.
- * @param render The callback which will be called every time the value is changed
- * @param cleanupOrOwner The object with method `own` or an callback to register lifecycle for the observer.
- * @returns Rendition which is created instantly
- */
-export function watch<W extends _WidgetBase, K extends keyof W>(
-    target: W,
-    prop: K,
-    render: (model: W[K]) => any,
-    cleanupOrOwner?: { own: CleanFn } | CleanFn
-): Rendition;
-/**
- * Observers the property and calls render callback each change.
- *
- * @param target The target object which property will be observed.
- * @param prop The name of the property.
- * @param render The callback which will be called every time the value is changed
- * @param cleanupOrOwner The object with method `own` or an callback to register lifecycle for the observer.
- * @returns Rendition which is created instantly
- */
-export function watch<T extends Stateful, K extends keyof StatefulProps<T>>(
-    target: T,
-    prop: K,
-    render: (model: StatefulProps<T>[K]) => any,
-    cleanupOrOwner?: { own: CleanFn } | CleanFn
-): Rendition;
-export function watch<T extends Stateful, K extends keyof StatefulProps<T> & string>(
-    target: T,
-    prop: K,
-    render: (model: StatefulProps<T>[K]) => any,
-    cleanupOrOwner: { own: CleanFn } | CleanFn = () => { }
-) {
-    let rendition = new FunctionRendition(() => render(target.get(prop)));
-    const _own = cleanupOrOwner instanceof Function ? cleanupOrOwner : (x: IRemovable) => cleanupOrOwner.own(x);
-    _own(target.watch(prop, (_name, oldValue, newValue) => {
-        if (oldValue !== newValue) {
-            const newRendition = new FunctionRendition(() => render(newValue));
-            newRendition.placeAt(rendition.getDomNode(), "replace");
-            destroy(rendition.getDomNode());
-            rendition = newRendition;
-        }
-    }));
-    return rendition;
-}
-
-/** Decorates the method which will be registered as the handle for the specified event.
- * This decorator can be applied to DjxWidgetBase subclass methods.
- *
- * ```
- *  @on("click")
- *  _onClick(eventObj: MouseEvent) {
- *      // ...
- *  }
- * ```
- */
-export const on = <E extends string>(...eventNames: E[]) =>
-    <K extends string,
-        T extends DjxWidgetBase<any, { [p in E]: EV }>,
-        EV extends Event
-    >(
-        target: T,
-        key: K,
-        _descriptor: TypedPropertyDescriptor<(eventObj: EV) => void> | TypedPropertyDescriptor<() => void>
-    ): any => {
-        const handlers = eventNames.map(eventName => ({ eventName, handlerMethod: key }))
-        target._eventHandlers = target._eventHandlers ? target._eventHandlers.concat(handlers) : handlers;
-    };
diff --git a/djx/src/test/ts/view/MyWidget.tsx b/djx/src/test/ts/view/MyWidget.tsx
--- a/djx/src/test/ts/view/MyWidget.tsx
+++ b/djx/src/test/ts/view/MyWidget.tsx
@@ -1,8 +1,7 @@
 import { djbase, djclass, bind, prototype, AbstractConstructor } from "../declare";
 
 import { DjxWidgetBase } from "../tsx/DjxWidgetBase";
-import { createElement } from "../tsx";
-import { on } from "../tsx/traits";
+import { createElement, on } from "../tsx";
 
 interface MyWidgetAttrs {
     title: string;