Adobe AIR, External swf file when loaded from swf does not render properly - actionscript-3

Question

I was trying to create an Adobe AIR application that loads an external swf file. However when the swf file is loaded from it does not render properly.
My Main.mxml file:
<mx:Application xmlns:fx="http://ns.adobe.com/mxml/2009" xmlns:mx="library://ns.adobe.com/flex/mx"
width="100%" height="100%" paddingLeft="0" paddingBottom="0" paddingRight="0" paddingTop="0"
creationComplete="Created()">
<fx:Script><![CDATA[
private var moduleLoader:Loader;
private function Created():void {
moduleLoader = new Loader();
var urlre: URLRequest = new URLRequest("Shell1.swf"); //http://localhost:8080/aps/
moduleLoader.contentLoaderInfo.addEventListener(Event.COMPLETE, loaded);
moduleLoader.load(urlre);
}
private function loaded(event:Event):void {
uic.addChild(moduleLoader);
}
]]></fx:Script>
<mx:UIComponent id="uic" width="100%" height="100%" ></mx:UIComponent>
</mx:Application>
My Shell1.mxml file:
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009" xmlns:mx="library://ns.adobe.com/flex/mx"
xmlns:s="library://ns.adobe.com/flex/spark"
width="100%" height="100%" creationComplete="Created(event)"
backgroundColor="0xf5deb3">
<fx:Script>
<![CDATA[
import mx.controls.Alert;
private function Created(event:Event):void {
}
]]>
</fx:Script>
<fx:Declarations>
<mx:RemoteObject id="RO" destination="AdministrationHandler"
fault="Alert.show(event.fault.faultString), 'Error'">
</mx:RemoteObject>
</fx:Declarations>
<s:Group id="Group" width="100%" height="100%">
<s:Label id="Introduction"
text="This is a demo application to show that the flex based application works. Click on the button below get generate a random number"
styleName="FilterLabel"/>
<s:VGroup id="VertGroup" paddingLeft="10" paddingRight="10" paddingTop="10" width="100%" height="100%">
<s:Label backgroundColor="green" width="1000" id="firstNumberLabel" text="Enter First Number"
styleName="FilterLabel"/>
<s:TextInput id="firstNumber" width="20%"/>
</s:VGroup>
</s:Group>
</s:Application>
When Shell1.swf is loaded directly in adobe air (by mentioning it application-descriptor.xml), it looks like:
But when I load it by using Main.mxml it looks like this:
So why is that the Components are not properly rendered when Shell1.swf is loaded from Main.swf ?