Hi Carsten,
I think you wish to know how thmlb:cellerator control is rendered with html tags like <tr> /<td> to display table rows.
Browser comes with developer tools which helps to find this. For example in IE9 , you can open developer tools , and in html tab , choose 'select element' button from toolbar. Then go to webpage and select the table control. The corresponding html tag will be highlighted in developer tools which shows how the cellerator is rendered.
Regards
Anirudha