Some of the columns generate their editing controls automatically, which brings convenience to the developer constructing the grid CRUD system. GridNumericColumn, for example, creates a RadNumericTextBox input control to enable only numeric characters when updating a numeric field. The ID of the automatically generated control starts with the RNTB prefix, which is abbreviation for RadNumericTextBox.
numBox = $telerik.findControl(container,
When Template form is used, however, the ID of any inner control is set manually. And it can be accessed later on using the same ID.