Hi Nyron,
The popup edit form is a child element of RadGrid. So, in order to be able to show up above the modal background, RadGrid must not be placed in a relatively/absolutely positioned container. If this is your scenario, please set the popup edit form to be non-modal or use another type of editing (EditForms, InPlace).
We may remove this limitation in the future by making the popup edit form render outside RadGrid.
Greetings,
Dimo
the Telerik team
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