If your TextArea has a lot of text, you get a scroll bar. If your datagrid has too many rows or columns, you get scroll bars. If your Image is too large, you can put it inside a container with scrollbars. Charts, however, do not have scrollbars. Charts with too much data look like this:
While porting some xpath-heavy AS2 code to AS3, I ran into problems. E4X (new and improved xml support in AS3) seems to make xpath obsolete. However, all the E4X query examples in the docs use hard-coded literals. I can't use literals because I don't know at code-time what the queries are going to be. My AS2 code creates xpath paths dynamically from variables. What is the E4X equivalent?