traverse the HTML to get the parent cell (each control offers a get_element() method that will return its HTML wrapper, so you can traverse the nodes hierarchy)
get the textbox controls inside (elem.control is this reference where elem is the HTML element that wraps the textbox)
You can inspect the rendered HTML to see what classes and elements are used to build your jQuery selectors.
Regards,
Marin Bratanov
Telerik
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