I put a layout:display tag inside layout:dataGrid, when I add a new row, it gives me a javascript error which said the name is not defined. I suspect that is caused by missing the name attribute within the <span> tag which is genearated by the layout:display tag.
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I have made a reasonably major change to the way that controls within the grid row are acquired in Javascript. This has fixed this issue and also made the grid more flexible for future tags to be managed within it.
These fixes are in SVN and will be in the next 0.7.4-SNAPSHOT release