RichText default property value is taking precedence over the text property

Steps to reproduce:
1. Compile and run:

<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009" xmlns:s="library://ns.adobe.com/flex/spark" xmlns:mx="library://ns.adobe.com/flex/mx">

<s:layout>
<s:HorizontalLayout />
</s:layout>

<!-- spark -->

<s:VGroup paddingLeft="10">

<s:RichText color="#0000FF" text="spark1" >
</s:RichText>

<s:RichText color="#0000FF" text="spark2"></s:RichText>

</s:VGroup>

<!-- halo -->

<s:VGroup paddingLeft="10">

<mx:Text color="#0000FF" text="halo1" >
</mx:Text>

<mx:Text color="#0000FF" text="halo2"></mx:Text>

</s:VGroup>

</s:Application>

Actual Results:

halo1
spark2 halo2

Expected Results:

spark1 halo1
spark2 halo2

Workaround (if any):