No grooves on wheels

[robertf]

I have added wheels, sliders and knobs to my application interface using Designer. The sliders and knobs seem to appear and function as they should. The wheels, however, have no grooves displayed on their surfaces. They also don't seem to do anything. Can anyone suggest what might be wrong, or where I should look?
This is with Qwt 5.1.1, with Qt 4.4.0 under Windows (XP and 2000).
Thanks.
- Robert

[robertf]

I got the wheels to work by doing an explicit setRange for each one. There doesn't seem to be a default range, and I don't see how to set it from Qt Designer.