code: public PercentComplete setPercentComplete(Integer percent) {
  		PercentComplete prop = (percent == null) ? null : new PercentComplete(percent);
  		setPercentComplete(prop);
  		return prop;
  	}
docs: Sets the amount that the to-do task has been completed.
  @param percent the percent complete (e.g. "50" for 50%) or null to remove
  @return the property that was created
  @see <a href="http://tools.ietf.org/html/rfc5545#page-88">RFC 5545
  p.88-9</a>
  @see <a href="http://tools.ietf.org/html/rfc2445#page-85">RFC 2445
  p.85</a>