I've created a base form with its own designer and an unfortunate side-effect is that a Menu control's designer will not show up when you drag a menu onto the form. From the MainMenu1 component in the "tray" you can right click and choose "Edit Menu" but it gets the error message... "Object reference not set to an instance...".
Everything else is working with the base form, inclluding custom designer verbs. Here is how I declare the designer:
internal class BaseFormDesigner : System.Windows.Forms.Design.DocumentDesigner
{
DesignerVerbCollection m_Verbs;
:
The menus Do work on the base form - but it is difficult for developers when they cannot use the menu designer. I've tried opening a second VS, chosing the debug process, enabling breaking on Exceptions which works but it says Source Code cannot be found. I only see system code in the call stack.....
Any ideas

Menu Designer not visible
daveky
space*it will start up the new instance for you and position you at the source code line.
Parboo
Hmm..well, I'm 0 for 6 at these forums.
Not to malign those of you who do answer questions here, has anyone found other "design-time" forums out there. Thx
Spaccabit
Though what the problem you are having is beyond me, it kind of sounds like maybe the default documentdesigner employs this service and yours isn't.
Doesn't sound like fun if that's the case, you could override the getservcie method and see what services it's looking for with a stop statement
Just an idea.
Matthew H. Sawyer