Sometimes it is necessary to create custom preview of the component in the Flex Builder “Design” view.
It is undocumented feature 😉
I’ve found very interesting class in the Flex SDK 3: mx.core.UIComponentGlobals.
This class contains static field designMode:Boolean.
Just check that field in your component code.
You can download example component with the source code from here:
Also you can download the usage sample:
Running in the Flex Builder “Design” mode it shows AnyChart image. But when it runs in the flash player it shows only gray rectangle.