Displaying Windows Forms inside unit test methods

I finally had some consistent success (and lack thereof) based on a single form property: ShowInTaskbar.

When a form had that property set to true, such forms would NOT display from a unit test method. When that property is false, all forms display. So, here are the rules as far as I know them to make sure a form can display from a unit test:

• The form should be created as a standard Windows Form item in the project.
• The form should have its ShowInTaskbar property set to FALSE.
• The form needs to be displayed modally (i.e. with ShowDialog()).

This has let me display and test all of my utility forms like date selectors and login screens.