Saving files with and without prompts using AIR AS3

Couple of bits of code for saving files using AIR:

This way does not open the save dialogue, just saves it automatically.

var stream:FileStream = new FileStream();
var saveFile:File = new File();

saveFile = saveFile.resolvePath(String(courseStructureURL));
var fileStream:FileStream = new FileStream();
fileStream.openAsync(saveFile, FileMode.WRITE);
fileStream.writeUTFBytes(String(Structure.xml));
fileStream.addEventListener(Event.CLOSE, fileClosed);
fileStream.close();

function fileClosed(e:Event):void 
{
Utils.alert("The course has been updated successfully.");
}

And this is the standard save way, where you select where to save it (standard flash way):

// this way uses a dialogue to save the file.
try { 
saveFile.save(String(Structure.xml), "course_structure.xml");
Vars.unedited = true; // reset unedited - we've saved it! NB not perfect. runs everytime structure is updated, not everytime anything is changed. 
} catch (e:Error) {
Utils.alert(String(e.errorID + ": " + e.message));
}

Obviously removing the contextual things in there!