The Red dot would be a extra element into the cell.... Mr. Rao will know the possibilities.
But this is also a option.
1 Coloring the cell like in this post :
viewtopic.php?f=3&t=40217&hilit=cellborder I didn't look the tread, but I would look into it. Maybe the colored box can be changed in layout like you would.
2 If the browse is not to big, create 1 png with the data of the cell and combine a transparent png with the red dot in upper right. Use this pics to browse, but it will slow down stuff (just a idea)
With option 1 your customer will see cellborders changed when tooltip data is there.
Just a idea )))