I want to create a custom property where in the "Value/Text Expression" column, a list of choices appears, similar to how the choice of "Yes" or "No" appears when you select "Yes or No" in the "Type" column.  Another way of putting it is, when I create a List type property in the property tab builder, I want that list to show up in the custom property list, not just the customer properties tab in the task pane.  Anybody have any suggestions?