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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