To be honest i always thought that you could not create ajax event on fields within a grid. But I’ve just seen that you can create them, so if you can then it should work I guess. What are you trying to achieve? In general you can apply a link to an image in the grid, or create links to achieve things. What special thing you need to do within the grid?
btw. It’s pretty logical that you cannot use functions which require field access. The point is that within a grid there’s no way to select the row you want to work on. Then you need to create a run button which gives you access to the selected rows. But you can useually pick some code from another event and copy that to here. It useually works.