[flexcoders] Problem While Downcasting Flex Modules

[parjan]

HI everyone,
I am facing a problem while down casting the flex module.

I have created two flex modules called FlexModule1.mxml and FlexModule2.mxml.
 
These both modules contain the same code.

I have placed FlexModule1.mxml under modules folder and FlexModule2.mxlm @ 
application root.
Here is code for FlexModul1.mxlml (and FlexModule2.mxml as both modules have 
identical code)

<?xml version="1.0" encoding="utf-8"?>
<mx:Module xmlns:mx="http://www.adobe.com/2006/mxml"; width="400" height="300">

<mx:Script>
        <![CDATA[ 
                public function Foo( pstr:String ):String
                {
                        trace( "In Method Foo" );
                        return "Foo" + pstr ;
                }
         ]]>
</mx:Script> 

        <mx:Panel width="100%" height="100%">
                <mx:Label id="MY_LABEL" text="I AM MODULE-1" fontSize="20" 
color="green"/>
        </mx:Panel>

</mx:Module>

And here is  Main class code.


<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"; layout="vertical" 
creationComplete="{loadModule()}">

<mx:Script>
        <![CDATA[
                import mx.modules.ModuleManager;
                import mx.modules.IModuleInfo;
                import modules.FlexModule1;
                import mx.events.FlexEvent;
                import mx.events.ModuleEvent;
                import mx.modules.ModuleLoader;
                
                public var moduleLoader:ModuleLoader;
                public var moduleInfo:IModuleInfo;
                
                public function loadModule(  ):void
                {
                        moduleLoader = new ModuleLoader();
                        moduleLoader.addEventListener( ModuleEvent.READY , 
moduleReadyEventHandler );
                        //moduleLoader.url = "FlexModule2.swf"; //This is fine 
module loaded   
                        moduleLoader.url = "modules\\FlexModule1.swf"; //this 
fine too                  
                        moduleLoader.loadModule();
                }
                                
                                
                public function moduleReadyEventHandler( evt:ModuleEvent ):void
                {
                        trace( "Module Ready Event Handler" );
                        this.addChild( moduleLoader );                          
                
                        (moduleLoader.child as FlexModule2).Foo( '' ) ; // this 
if fine method Foo() called
                        (moduleLoader.child as FlexModule1).Foo( '' ) ; // Null 
pointer Exception
                }
                 ]]>
                 
</mx:Script>

</mx:Application>

Both modules are loading without any problem but the error occurs when I try to 
downcast  FlexModule1.mxml. There is no down casting  problem with 
FLexModule2.mxlm.
I think the problem is with different folder i have used for FlexModule1.mxml , 
 may b i am wrong. 
Please let me know where  is the problem.