There is a hard way to do it:
Use a ring which is normally invisible. When the user clicks a cell (propably you want to limit this to certain columns), you move the ring at the position of the cell and make it visible. It needs some coding to make it work, so any other approach is preferable. Furthermore, I didn't succeed in aligning everything properly (the border of the ring did match the cell border, but the string inside the ring was misaligned to the strings in the other cells).
Felix
