I have an app which uses a toolbar with several buttons. A couple of users who have set their operating system to use large fonts reported all the toolbar buttons don't show. Apparently their larger fonts are causing the toolbar to expand beyond the limits of the form.

Is there a way to tell if the OS has been set to large fonts instead of the default display. What I want to do is just give them a message that the toolbar may not display correctly and they should use the equivalent task from the menu bar instead of the toolbar. Something like that.

Users have systems ranging from XP to Vista.