Scott, that is brilliant! I love the binary logic you've added. For using 
attributes it seems that I'm missing something. In this example 
<http://jsbin.com/cogowopu/7/edit>I tried using a "label" optional 
attribute for putting a label on "all" checkbox. But it didn't seem to work 
the way I was expecting. It's picking up default attribute no matter if I 
pass the label attribute or not. I followed 
this<https://github.com/Polymer/polymer-ui-menu/blob/master/polymer-ui-menu.html>example
 for using attributes.

On Monday, March 3, 2014 10:56:36 AM UTC-8, Scott Miles wrote:
>
> http://jsbin.com/cogowopu/6/edit
>
> I believe Steve already explained most of what I did here. Please follow 
> up if there is something you don't understand.
>
>
> On Mon, Mar 3, 2014 at 10:45 AM, Mohsen Azimi <[email protected]<javascript:>
> > wrote:
>
>> 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"?
>>>>
>>>  Follow Polymer on Google+: plus.google.com/107187849809354688692
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