Making my custom incoming call screen

[Guest davoli]

I'm trying to make my own incoming call screen in VS2005 for a smartphone with WM6, the problem is that I need to disable the deafult incoming call screen because it got front when a call enters and my form be behind.

How to disable the default incoming call screen?

I saw the registry HKEY_LOCAL_MACHINE\Software\Microsoft\Shell\Rai\:Callalert removing the BKBitmapFile but it isn't the solution.