PyQt4 designer custom properties - combo box style

[Andrew]

I am creating custom widgets for the PyQt4 Designer. I can create
custom properties, but I'm looking for how to create a custom property
that has a combo box drop down. I've seen them in the example widgets
and tried following them, but they are using pre-defined items to
populate their property, so it's not a very clear example of how to
get the combo box property to work.

Is there any other examples or help for this kind of setup?

Thanks,
Andrew