Thank you for your quick response.
If we add "dataIndx" as per the code below then the checkbox is replaced with "true/false" text. I need a checkbox & the user can be checked/unchecked.
Also, please advise how to trigger the event & save the checkbox value in the database when the user checked/unchecked the checkbox.
{
title: "Edit?",
dataIndx: "IsOnOff",
width: 50,
dataType: "bool",
align: "center",
editor: false,
type: 'checkbox',
editable: true,
cls: "largerCheckbox16NoToggle"
}