Macromedia flex 2 Manuale

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Creating Simple MXML Components

If you define a type selector for a superclass of the custom control, and for the custom control 
itself, Flex ignores any conflicting settings from the type selector for the superclass, as the 
following example shows:

<?xml version="1.0"?>
<!-- mxml/MainStyleOverrideUsingCBTypeSelConflict.mxml -->
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" 
    xmlns:MyComp="myComponents.*">

    <mx:Style>
        ComboBox {
            color: red;
            openDuration: 1000;
            fontSize: 15;
        }
        StateComboBoxWithStyleProps {
            color: green;
        }
    </mx:Style> 

    <MyComp:StateComboBoxWithStyleProps/>
    <mx:ComboBox/>
</mx:Application>

In this example, the StateComboBox control uses green text, and the values for the 

fontSize

 

and 

openDuration

 styles specified in the type selector for the ComboBox control.