Cusomt controls no longer showing up in the toolbox - 2005 RC1 problem

Hi,

I have created several libraries of windows form custom control written
using Visual Studio 2005 Beta 2. I recently upgraded to RC1.

The problem:

When building the solution in Beta 2, the toolbox would automatically update
by adding all custom controls from all projects found within my solution.

In RC1 this is no longer the case. Custom controls simply do not show up.
Even if AutoToolboxPopulate is true.

Anyone had this problem and found a solution? Any help would be greatly
appreciated.

Thanks,
...Marc