Great reminder, Mike! And also while the subject is still at the forefront, it would be a nice enhancement if a user hovered over the up or down arrow if a tooltip popped up to let the user know what the next level would reveal (or to give the dashboard author that ability). I have always found that space is always at a premium in dashboard report tabs and currently I have to either use a text box to let a user know what will be uncovered or let them just find out for themselves (if I don't want a very long and awkwark visual title).
Again, great job and thanks! Your attentiveness is a great sign of things to come!