Opps! I forgot to paste new code. Here it is:
http://jsbin.com/cogowopu/5/edit

On Monday, March 3, 2014 10:45:16 AM UTC-8, Mohsen Azimi wrote:
>
> Thank for you comments. I've updated my element. Now I'm using your advice 
> to make it better. 
>
> Couple of issues:
>
> 1. domReady doesn't seem to work. When I put a breakpoint inside a 
> domReady method it doesn't stop there.
> 2. When clicking on "all" checkbox, this.$.group.innerHTML is 
> "<content></content>". I can't see my checkboxes.
>
> Could you please review my code again?
>
>
> On Sunday, March 2, 2014 3:25:52 PM UTC-8, Mohsen Azimi wrote:
>>
>> Hi,
>>
>> I just started using Polymer. It's great and easy to pick up. My first 
>> element is a grouped checkbox. Like ones that exist in native platforms. 
>> There is a "select all" checkbox that select all options. 
>>
>> Here is my element: 
>> http://jsbin.com/cogowopu/1/edit
>>
>> I have three questions:
>>
>> 1. Is it recommended to use native HTML elements in our elements? If so, 
>> how we can make a modified version of them? In this case, I need a checkbox 
>> that supports "some checked" statue. (usually a solid square inside of it). 
>> I want to use the CSS that defines checkbox appearance so I can make my 
>> modified version looks like native ones in each platform. Where can I get 
>> that CSS?
>>
>> 2. Why event.target is replaced with event.srcElement? What is 
>> event.target now?
>>
>> 3. How can I avoid using "that"?
>>
>

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