How to do proxy authenticaion at runtime - in Axis2 client or stub?

HttpTransportProperties.ProxyProperties proxyProperties = new HttpTransportProperties().new ProxyProperties();
proxyProperties.setProxyHostName("axis2");
proxyProperties.setProxyPort(9762);
proxyproperties.setDomain("axis2/anon");
proxyproperties.setPassWord("passwd");
proxyproperties.setUserName("usernm");
//in order to makesure that we use HTTP 1.0
options.setProperty(MessageContextConstants.HTTP_PROTOCOL_VERSION,HTTPConstants.HEADER_PROTOCOL_10);
options.setProperty(org.apache.axis2.transport.http.HTTPConstants.PROXY,proxyProperties);