I am not sure that I understand exactly what you have tried and to which element you have set the accesskey attribute, but please note that this is applicable for "<a>, <area>, <button>, <input>, <label>, <legend>, and <textarea>" elements and although that you could focus any element (in html5
), the tabbing will move the focus across those elements only.
As for the TabIndex property of the INPUT elements, there should be no problem to achieve this in SharePoint and you only need to get reference to the editors within your RadGrid and set their TabIndex property in ascending order (that order could be used for multiple grids as well, so this is also not a problem
Finally, please note that this requirement is not related to RadGrid in any way, because the tabbing functionality follows the browser behavior and if you need to customize it you will have to either use the TabIndex or handle the keydown event of your document and manually focus the elements when the tab key is pressed.
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