code: public WnsNotificationResponse pushTile(String channelUri, WnsNotificationRequestOptional optional, WnsTile tile) throws WnsException {
  		return this.client.push(xmlResourceBuilder, channelUri, tile, this.retryPolicy, optional);
  	}
docs: Pushes a tile to channelUri using optional headers
  @param channelUri
  @param optional
  @param tile which should be built with {@link ar.com.fernandospr.wns.model.builders.WnsTileBuilder}
  @return WnsNotificationResponse please see response headers from <a href="http://msdn.microsoft.com/en-us/library/windows/apps/hh465435.aspx#send_notification_response">http://msdn.microsoft.com/en-us/library/windows/apps/hh465435.aspx#send_notification_response</a>
  @throws WnsException when authentication fails