example of the Apdev SpellChcker class

You can now easily use the Squiggly spell-checking library with every TextField in Actionscript (not only Flex).

import com.apdevblog.text.spelling.ApdevSpellChecker;
// ...

// create + add new TextField
var txt:TextField = new TextField();
addChild(txt);

// create new SpellChecker and set TextField as target
// second parameter is the URL to the dictionary
var url:String = "data/usa.zwl";
var checker:ApdevSpellChecker = new ApdevSpellChecker(txt, url);

you should see our spellchecker here (alternativ content)

Adobe Squiggly: http://labs.adobe.com/technologies/squiggly/
blog post: http://apdevblog.com/actionscript-spellchecker-for-flash-textfields-with-source-code-and-example/