[flexcomponents] How to create a custom component dynamically by name?

[amywongwy]

My current implementation assumes the data comes from an xml file,
while specifies the class name of the custom component.
In Flex, the getDefinitionByName(String) method allows me to have a
class declaration of dynamically create a component. However, a
limitation in Flex requires me to have a class declaration of the
dynamic class in the component before I can call getDefinitionByName().

Is there any way that I can create a custom component dynamically by
name without creating a class declaration?