If you’re using Adobe Photoshop to create Flex skins, you create bitmap graphics instead of vector graphics. When
using bitmap graphics for skinning, there are a few issues you should be aware of:

Adobe Illustrator lets you create vector artwork for Flex skins. Some features of Illustrator are not supported when
you export skins to a SWF file. For example, blend modes and effects, including drop shadows, may not display
correctly. If you want to use these or other advanced Illustrator features, first test them with a single skin.

You can use Flash CS3 to create vector graphics for Flex skins. Before you can create Flex skins in Flash CS3, you
must install the Flex Component Kit for Flash CS3. The Flex Component Kit installs the SWC file that contains the
classes necessary to create assets compatible with Flex.

Skinning is the process of changing the appearance of a component by modifying or replacing its visual elements.
These elements can be made up of bitmap images, SWF files, or class files that contain drawing methods that define
vector images.
Skins can define the entire appearance, or only a part of the appearance, of a component in various states. For
example, a Button control has eight possible states, and eight associated skin properties.

Applying Styles