Use style to change font size and weight for RadioButton and Label
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">
<mx:Style>
@namespace mx "http://www.adobe.com/2006/mxml";
mx|RadioButton, mx|Label {
font-size:10;
font-weight:bold;
}
</mx:Style>
<mx:Panel title="Select a vehicle" width="135">
<mx:RadioButton label="Plane" value="plane" groupName="vehicleGroup"/>
<mx:RadioButton label="Train" value="train" groupName="vehicleGroup"/>
<mx:RadioButton label="Automobile" value="car" groupName="vehicleGroup"/>
<mx:RadioButtonGroup id="vehicleGroup" />
<mx:ControlBar>
<mx:Label text="asdf"/>
</mx:ControlBar>
</mx:Panel>
</mx:Application>
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