playing with the Kendo UI Builder and just thinking of how to best format the popup dialogs for editing.
I have not looked into this in detail but I wonder if the editable.template property of the Grid is what you are looking for.
There is also an old post in the Telerik forums which suggests that you can use kendo.template($("#popup_editor").html() to obtain the template from a HTML element. You should be able to specify the HTML in a custom section HTML file (<project>/src/html/<module-view>/topSection.html).
I hope this helps.