Is it possible to add a comment to a cell using a User Defined Function?
Yes, it should work the same as setting a cell. You can even use user defined functions for images (as you can see in the sample B0.Features Page )
ah, ok, sorry for the misunderstanding.
ok, I sent "Post reply" too soon. I also wanted to mention that the reason I think you might not need any of this is because you can do it directly with FlexCel and no UDF.
Perfect, that's exactly what I needed!