How to unchecked all the checked checkbox on button click.

I have a table with each row having checkbox.If I checked the checkbox after that I click on cancel button then all the checkbox should be unchecked.

Here is my snippet
http://webix.com/snippet/d74d455c

How can I do this please help me.

Thanks

http://webix.com/snippet/cf86610b

Hi Intregal,
Thank you so much,You are awesome.