Fixes: - RequiresSTA needed. - StackPanel instance must be created in the same thread as the test.
Fixes:
- RequiresSTA needed.
- StackPanel instance must be created in the same thread as the test.

bryanedds/FSharpx.Extras,bryanedds/FSharpx.Extras,sideeffffect/FSharpx.Extras,fsprojects/FSharpx.Extras,sideeffffect/FSharpx.Extras,fsprojects/FSharpx.Extras,bryanedds/FSharpx.Extras