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Is possible to add a paper-menu at row-level?
Hi! Sorry for missing your question :(
Do you mean this one: https://elements.polymer-project.org/elements/paper-menu?view=demo:demo/index.html&active=paper-menu
If yes, I don’t see any reason why you couldn’t. You need to use a cell renderer, and increase the row height of the grid to accommodate the full height of the menus.