If a module contains a component with default styles that aren't in the main application domain, those styles will get registered with the StyleManager and pin the module in memory. For example, TextArea is in the module and not in the main app. If you load the styles for TextArea in the main app that should help the module unload. Try using the RSL linkage and/or a CSS module loaded into the main applicationdomain.
Flex SDK Developer
Adobe Systems Inc.
Thanks for your reply~
I'm sorry that I couldn't understand what this mean:
"Try using the RSL linkage and/or a CSS module loaded into the main applicationdomain."
I have used RSL or merged into the code, that's all the same, CSS modue? what's that? How could I load it? Do you mean a CSS swf?