Add a radio button in RichTextArea

There is a RichTextArea

private final RichTextArea rta = new RichTextArea();

and I'd like when I press an asterisk to add a radio button in this RichTextArea.

I wrote

 if(event.getCharCode()=='*')
   {            
     RadioButton radio0 = new RadioButton("group0", "");
     HorizontalPanel hp = new HorizontalPanel();
     hp.add(radio0);
     RootPanel.get().add(hp);
   }

it creates a radio button out of the RTA but I can't add it in the RTA, specifically where the cursor is and without the asterisk.

Any idea how to do that? Thank you very much for any help in advance.

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