How to make your .NET application disappear from the Task Switch (Alt + Tab) list

I kinda stumbled on this via a bug-report.
Basically if you have your WinForm (e.g. a modal dialog) properties
• BorderStyle set to FixedToolWindow or SizableToolWindow
• AND ShowInTaskBar set to false

When the form is up and you hit Alt+Tab, the task switch won't have your application in the list. You live you learn...