diff --git a/src/main/ts/tsx/BuildContextBase.ts b/src/main/ts/tsx/BuildContextBase.ts
--- a/src/main/ts/tsx/BuildContextBase.ts
+++ b/src/main/ts/tsx/BuildContextBase.ts
@@ -1,5 +1,5 @@
 import { isNull, mixin } from "@implab/core-amd/safe";
-import { isPlainObject, isNode, isBuildContext, DojoNodePosition, BuildContext, isInPage } from "./traits";
+import { isPlainObject, isNode, isBuildContext, DojoNodePosition, BuildContext, isInPage, isWidget } from "./traits";
 
 import dom = require("dojo/dom-construct");
 import registry = require("dijit/registry");
@@ -29,7 +29,7 @@ export abstract class BuildContextBase<T
         }
     }
 
-    getChildDom(v: any) {
+    protected getItemDom(v: any) {
         const tv = typeof v;
         if (tv === "string" || tv === "number" || v instanceof RegExp || v instanceof Date) {
             return document.createTextNode(v.toString());
@@ -37,6 +37,10 @@ export abstract class BuildContextBase<T
             return v;
         } else if (isBuildContext(v)) {
             return v.getDomNode();
+        } else if(isWidget(v)) {
+            return v.domNode;
+        } else if(tv === "boolean" || v === null || v === undefined) {
+            return document.createComment(`[${tv} ${String(v)}]`);
         } else {
             throw new Error("Invalid parameter");
         }
diff --git a/src/main/ts/tsx/DjxFragment.ts b/src/main/ts/tsx/DjxFragment.ts
--- a/src/main/ts/tsx/DjxFragment.ts
+++ b/src/main/ts/tsx/DjxFragment.ts
@@ -1,18 +1,6 @@
-import { _Widget } from "./WidgetContext";
-import { MapOf } from "@implab/core-amd/interfaces";
-import { prototype } from "../declare";
-
-/** Special widget used to create a document fragment */
-export class DjxFragment implements _Widget {
-
-    domNode: Node;
-
-    containerNode: Node;
-
-    constructor() {
-        this.domNode = this.containerNode = document.createDocumentFragment();
-    }
-    buildRendering() {
-        // this function marks this class as _Widget
-    }
+/** Special functional component used to create a document fragment */
+export function DjxFragment({children}: {children: Node[]}){
+    const fragment = document.createDocumentFragment();
+    if (children)
+        children.forEach(child => fragment.appendChild(child));
 }
\ No newline at end of file
diff --git a/src/main/ts/tsx/FunctionComponentContext.ts b/src/main/ts/tsx/FunctionComponentContext.ts
--- a/src/main/ts/tsx/FunctionComponentContext.ts
+++ b/src/main/ts/tsx/FunctionComponentContext.ts
@@ -19,9 +19,9 @@ export class FunctionComponentContext ex
 
     _create(attrs: object, children: any[]) {
         const _attrs: any = attrs || {};
-        _attrs.children = children.map(x => this.getChildDom(x));
+        _attrs.children = children.map(x => this.getItemDom(x));
 
-        this._node = this.getChildDom(this._component.call(null, _attrs));
+        this._node = this.getItemDom(this._component.call(null, _attrs));
     }
 
     _getDomNode() {
diff --git a/src/main/ts/tsx/HtmlElementContext.ts b/src/main/ts/tsx/HtmlElementContext.ts
--- a/src/main/ts/tsx/HtmlElementContext.ts
+++ b/src/main/ts/tsx/HtmlElementContext.ts
@@ -17,7 +17,7 @@ export class HtmlElementContext extends 
     _addChild(child: any): void {
         if (!this._element)
             throw new Error("The HTML element isn't created");
-        dom.place(this.getChildDom(child), this._element);
+        dom.place(this.getItemDom(child), this._element);
     }
 
     _create(attrs: object, children: any[]) {
diff --git a/src/main/ts/tsx/WidgetContext.ts b/src/main/ts/tsx/WidgetContext.ts
--- a/src/main/ts/tsx/WidgetContext.ts
+++ b/src/main/ts/tsx/WidgetContext.ts
@@ -45,14 +45,14 @@ export class WidgetContext extends Build
                     throw new Error("The widget doesn't have neither addChild nor containerNode");
 
                 // the current widget isn't started, it's children shouldn't start too
-                dom.place(this.getChildDom(child), instance.containerNode);
+                dom.place(this.getItemDom(child), instance.containerNode);
             }
         } else {
             if (!instance.containerNode)
                 throw new Error("The widget doesn't have neither addChild nor containerNode");
 
             // the current widget isn't started, it's children shouldn't start too
-            dom.place(this.getChildDom(child), instance.containerNode);
+            dom.place(this.getItemDom(child), instance.containerNode);
         }
     }
 
@@ -65,7 +65,7 @@ export class WidgetContext extends Build
 
             // render children to the DocumentFragment
             const content = document.createDocumentFragment();
-            children.forEach(child => content.appendChild(this.getChildDom(child)));
+            children.forEach(child => content.appendChild(this.getItemDom(child)));
 
             // set the content property to the parameters of the widget
             const _attrs = { ...attrs, content };