Setting enabled=false on any Spark container does not set its children to be disabled

Steps to reproduce:
1. Compile and run the following application:
<?xml version="1.0" encoding="utf-8"?>
<FxApplication xmlns="http://ns.adobe.com/mxml/2009" backgroundColor="0xCCFF00">
<layout>
<VerticalLayout/>
</layout>

<FxContainer id="myPanel" enabled="false" >
<FxButton label="child 1." />
<FxTextInput text="child 2." />
</FxContainer>

<FxButton label="enable/disable Panel" click="myPanel.enabled=!myPanel.enabled"/>
<FxTextArea text="disabled text." enabled="false"/>
</FxApplication>

Actual Results: The children of the FxContainer do not look disabled.

Expected Results: The children of the FxContainer should be disabled.

Workaround (if any):