I checked row of table,Now It is updating all the selected row.I am trying to get old date of all.

I checked row of table,Now It is updating all the selected row.But I am tring to get old date of all checked row.How can I get that.

Note# I used state,But it is showing error for editor undefined.

Here is my snippet
http://webix.com/snippet/7b9dc7c7

Please help me.

Answer at http://forum.webix.com/discussion/comment/15985/#Comment_15985