Mainly Twhirl is Adobe AIR based software which has been intended to optimize the knowledge of twitter user. Twhirl, a social software desktop client for several services like Twitter, Seesmic, Friendfeed and identi.ca. Twhirl is a client that allows users to access the microblogging network system more expediently.

The following example shows how you can apply smoothing to a background image fill on an MX Panel container in Flex 3 by extending the BitmapAsset class, setting the Boolean smoothing property, and setting the backgroundImage and backgroundSize styles.

<?xml version="1.0" encoding="utf-8"?>

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Create and use a custom application skin with Flex 4 and MXML graphics.

The following example shows how you can check whether the user has selected an item in the Spark DropDownList control in Flex 4 by setting the Boolean requiresSelection property to true or using a NumberValidator to check the DropDownList control’s selectedIndex property is greater than -1.

<?xml version="1.0" encoding="utf-8"?>
http://blog.flexexamples.com/2010/03/12/checking-that-an-item-is-selecte... -->