Main.mxml

<!-- Main.mxml -->
<?xml version="1.0" encoding="utf-8"?>
<js:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
				xmlns:local="*"
				xmlns:js="library://ns.apache.org/flexjs/basic" 
				applicationComplete="onApplicationComplete()">
	
	<fx:Script>
		<![CDATA[
			import com.undo_redo_demo.core.TestClass;
			
			private function onApplicationComplete():void {
				var testClass:TestClass = new TestClass(myView);
				
				// Works as expected:
				myView.setData("First call of setData()"); 
				
				// Works only with swf version:
				testClass.view.setData("Call of setData() using an Interface"); 
				
				// Works only with swf version:
				// (Seems that all code after the previous call isn't executed with the js version
				// cause of the interface issue)
				// myView.setData("Second call of setData()"); 
			}
			
		]]>
	</fx:Script>
	
	<js:valuesImpl>
		<js:SimpleCSSValuesImpl />
	</js:valuesImpl>
	<js:initialView>
		<local:MyInitialView id="myView" />
	</js:initialView>
	
</js:Application>

<!-- MyInitialView.mxml -->
<js:ViewBase xmlns:fx="http://ns.adobe.com/mxml/2009"
				xmlns:js="library://ns.apache.org/flexjs/basic" 
				implements="com.undo_redo_demo.core.interfaces.IViewMyInitialView">
	
	<fx:Script>
		<![CDATA[
			public function setData(data:String):void {
				btntest.text = data;
			}
		]]>
	</fx:Script>
	
	<js:Container>
		<js:beads>
			<js:VerticalLayout />
		</js:beads>
		<js:TextButton id="btntest" text="Test it..." width="200" />
	</js:Container>
	
</js:ViewBase>

<!-- IViewMyInitialView.as -->
package com.undo_redo_demo.core.interfaces
{
	public interface IViewMyInitialView
	{
		function setData(data:String):void;
	}
}

<!-- TestClass.as -->
package com.undo_redo_demo.core
{
	import com.undo_redo_demo.core.interfaces.IViewMyInitialView;
	
	public class TestClass 
	{
		private var _view:IViewMyInitialView;
		
		public function TestClass(view:IViewMyInitialView) {
			_view = view;	
		}	
		
		public function get view():IViewMyInitialView {
			return _view as IViewMyInitialView;
		}
	}
}