SHIFT+ENTER adding a new line - chat textfield

Looking all over the internet for a simple adding a new line when pressing SHIFT+ENTER... not to be found.

So, for the ones who also looked very long, here is an example.
This sample also disables the ENTER key. Only when you hit SHIFT+ENTER it adds a new line to the textfield

public class TextfieldSample extends Sprite
 {
  private var textfield:TextField;

  public function TextfieldSample()
  {
   //Creating the textfield an adding it on stage.
   textfield = new TextField();
   
   //event to disable the ENTER key
   textfield.addEventListener(TextEvent.TEXT_INPUT, handleTextEvent);
   //event to enable SHIFT+ENTER key
   textfield.addEventListener(KeyboardEvent.KEY_DOWN, handleKeyDown);
   
   //Make it an input textfield
   textfield.type = TextFieldType.INPUT;
   
   //Just use border to show it easy on stage.
   textfield.border = true;
   //You need multiline for adding new lines.
   textfield.multiline = true;
   
   addChild(textfield);
  }

  private function handleTextEvent(event:TextEvent):void
  {
   if (event.text.charCodeAt() == 10) 
   {
    //char code 10 == ENTER key
    event.preventDefault();
   }
  }

  private function handleKeyDown(event:KeyboardEvent):void
  {
   if(event.shiftKey)
   {
    if(event.keyCode == Keyboard.ENTER)
    {
     //You need to give something else the focus, otherwise the textfield is blocked 
     //and adding the new line will not work.
     stage.focus = stage;
     //Don't use appendtext for adding a new line, this function does not puts the new line in the correct position.
     textfield.replaceText(textfield.selectionBeginIndex, textfield.selectionBeginIndex, "\n");
     //Give the textfield the focus again
     stage.focus = textfield;
    }
   }
  }
 }

If you have any improvement for this code, just let me know...