Fullscreen not working in Direct2D (slimdx)

Question

Hi,

I'm having a strange problem when switching to fullscreen (alt+enter or swapchain->SetFullscreenState(...)), the application enters fullscreen en i can see a black screen but it's still rendering in a window behind the black screen. And after a couple of seconds the black screen disappears. The thing is the window changed it's size after the fullscreen switch.

PS: I'm using WinForms and i've even tried creating a non windowed application but same result.

Thx