When trying to add 2 grids inside the same cell i can then only select the first one with mouse. The rest become unselectable :(
in this case can you give us more details about this behaviour?
The bottom grid can't be selected only the upper one.
Steps: create 2 grids in different cells and then merge cells (webratio doesn't allow to add 2 grids into the same cell, maybe because of this bug? I don't see another reason).