If there are no rows in a DataGrid, the Validation Popup is not visible without scrolling the div.
This can be reproduced on the InLine Editing demo page:
- Filter Order ID to a nonexistent order number in order to hide all rows
- Click Save with an empty required field (Ship Name) to show the validator
Just checking if there is a simple style setting that could fix this other than not using a Popup, which in turn misaligns the textboxes