hehe , your machine may be rendering it funny, but if you look, Magenta is the transparent color of the window.  The Themed window is the same window that is used by the database connection settings, or any of the StrataFrame message boxes that you see.  If you call the form, is it still pink?  You can turn off the transparency if you are not planning on using it within the form and the pink will go away.

I added a SF Themed Window to my project. The Designer just shows a pink square. ????