Disabled RadioButton can be programatically selected

Steps to reproduce:
1. Compile & run:
<?xml version="1.0" encoding="utf-8"?>
<FxApplication xmlns="http://ns.adobe.com/mxml/2009">
<Declarations>
<FxRadioButtonGroup id="srg"/>
</Declarations>
<VGroup>
<FxRadioButton id="s1" label="Spark 1" />
<FxRadioButton id="s2" label="Spark 2"/>
<FxRadioButton id="s3" label="Spark 3"/>
<FxRadioButton id="s4" label="Spark 4" enabled="false"/>
<FxRadioButton id="s5" label="Spark 5"/>
</VGroup>

<FxButton y="180" click="s4.selected=true" label="Select disabled button" />

</FxApplication>

2.Click the button to programmatically select the disabled RadioButton.

Actual Results:
Disabled FxRadioButton is selected

Expected Results:
Disabled FxRadioButton should not be able to be selected.

Workaround (if any):