Select one row out of multiple grids

Clarification: Do you mean Dashboard or Mashup?

For Dashboard, no.

For Mashup, it will be hard to find someone knowing about a version that old, and what the grid widget supported that time.

You would need something like a clearselection or setselection property on the grid and when one grid has a selectionchanged event, you could clear the other grids (but that would launch a selectionchanged on the other grids and you would run in an endless loop).

I doubt you could make it work in a robust way.