Flex supports external CSS style sheets. You can declare the location of a local style sheet or use the external style sheet to define the styles that all applications use. To apply a style sheet to the current document and its child documents, use the source property of the <mx:Style> tag.
NOTE
You should try to limit the number of style sheets used in an application, and set the style sheet only at the top-level document in the application (the document that contains the <mx:Application> tag). If you set a style sheet in a child document, unexpected results can occur.
The following example points to the style.css file in the flex_app_root/assets directory:
The Zoom effect zooms the object in or out on a center point.
When you apply a Zoom effect to text rendered using a system font, Flex scales the text between whole point sizes. While you do not have to use embedded fonts when you apply a Zoom effect to text, the Zoom will appear smoother when you apply it to embedded fonts.
Note: The Zoom effect does not work when the Container.autoLayout property is false.
The <mx:Zoom>tag inherits all of the tag attributes of its superclass, and adds the following tag attributes:
The WipeLeft class defines a bar wipe left effect. The before or after state of the component must be invisible.
You often use this effect with the showEffectand hideEffecttriggers. The showEffect trigger occurs when a component becomes visible by changing its visible property from false to true. The hideEffect trigger occurs when the component becomes invisible by changing its visible property from true to false.