code: protected void prepareKeyEvents(StringBuffer handlers) {
  		prepareAttribute(handlers, "onkeydown", getAttribute("onkeydown"));
  		prepareAttribute(handlers, "onkeyup", getAttribute("onkeyup"));
  		prepareAttribute(handlers, "onkeypress", getAttribute("onkeypress"));
  	}
docs: Prepares the keyboard event handlers, appending them to the the given
  StringBuffer.
  
  @param handlers
  The StringBuffer that output will be appended to.