def update_display(options = { })
raise ArgumentError, "uuid is a required parameter" unless options.has_key? :uuid
display = { }
display[:type] = options[:type] || 'vnc'
display[:port] = (options[:port] || -1).to_s
display[:listen] = options[:listen].to_s if options[:listen]
display[:passwd] = options[:password].to_s if options[:password]
display[:autoport] = 'yes' if display[:port] == '-1'
builder = Nokogiri::XML::Builder.new { graphics_ (display) }
xml = Nokogiri::XML(builder.to_xml).root.to_s
client.lookup_domain_by_uuid(options[:uuid]).update_device(xml, 0)
true
end