Picked not work in non standard Gui

Hi,
if I use a non standard drawing surface, for ex a picture box
b3d.SetBlitz3DHWND(PictureBox.Handle.ToInt32)
the functions PickedX, PickedY, PickedTime, PickedSurface exc... do not work. Why?
Thk.
Bye.

I have the same problem with key input. Blitz can only get key and mouse input if it runs on its own form. If you send it to a .NET or another kind of form, it doesn't get user input. (as far a I could test)