If you need just the edit form to be ajaxified - this is not a supported scenario since the edit form is part of the grid and when you put the grid in an UpdatePanel or ajaxify it through the RadAjaxManager control (which is essentially the same since what the RadAjaxManager does is to create update panels around its ajaxified control) you are effectively putting the edit form as well.
If you need some of the controls on the edit form to fire ajax requests, then you can obtain a reference to those controls in the ItemCreated event of the grid and set their AutoPostBack property to true. For example, if you have a column "Country" and you need the textbox for this column in the edit form to fire an ajax request, then you should do the following:
sender, GridItemEventArgs e)
GridEditableItem && e.Item.IsInEditMode)
I hope this helps.
the Telerik team
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