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I have a multiselct grid. But I can't figure out how I can post the rows ID' back in a post.
Do U have any sample of how I can do this?
Is there anything build in the js?

To obtain list of selected id:

            var val=grid.getSelectedId(); //return list of id'

   I'm not sure about "post the rows ID' back in a post", do you want to send them by using grid AJAX engine? (it supports POST requests)

The information connected with ajax php progress bar and javascript editable combobox also can help you, so please check it too.