>That is how our framework works. We have an icon with an A and an arrow and there are three preset sizes everytime you click the icon.

Large, Medium, Small? :) I got the 5 number from IE5 which has

Largest
Larger
Medium
Smaller
Smallest

Anyway, once you build in a flexible resizing mechanism (which works the same way as Setcolors() basically, and goes on the same System Settings modal form, I'm sure you recall that), the number of different sizes is easy to change...of course too many, and the user may play with it too much, and as we all know, this is the type of thing that can generate a crash no matter how strong your code is :)

3 sounds like a good number to start testing with, anyway, and maybe add 1 or 2 more if needed.