Transparent Window with Direct2D

[bluejamesbond]

How do you create a window which is transparent and borderless while being able to draw with Direct2D onto the screen?

When I set the window style to WS_EX_LAYERED and then clear render target with a transparent color (0,0,0), 0.0f, the window still remains black.

If someone could show me or point me to some information with which I can make the window transparent, it would be much obliged.