nativescript - Pass arguments to custom component -

i created component , nice use ;) don't know how pass arguments;

use:

<page xmlns="http://www.nativescript.org/tns.xsd"       xmlns:mastermenu="includes/customcomponents/mastermenu">     <mastermenu:mastermenu selected="1"/> </page> 

how can catch selected in component? have mastermenu.xml , mastermanu.css files.

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let have component named question (pseudo code):

xml

< stacklayout loaded="loaded">

< label text="question: loremipsum" /> < label text="answer 1" id="answer1" /> < label text="answer 2" id="answer2"/> < label text="answer 3" id="answer3"/> 

< /stacklayout>

js

exports.loaded = function(args) {

var answerno = args.answerno,     page = args.object;  page.getelementbyid(page, "answer"+answerno).addclass('correct')  

}

used :

< page xmlns="http://www.nativescript.org/tns.xsd" xmlns:question="includes/customcomponents/question">

< question:question answerno="2" />

< question:question answerno="1" />
< question:question answerno="3" />

< /page>

in javascript access this:

var menu = page.getviewbyid("idofmenucomponent"); menu.selected; 

that assuming it's available accessed. depend on how have component created. if it's not available need add property component. have @ <button> module see how can done.