WinForm with UserControl containing DataGridView causes Designer issue

You are correct but when I about to switch to design view, I switch the inheritance back to plain old Form class.  VS2008 does not understand inheritance with generics
Example
public partial class QueryForm : MvpFormBase<QueryFormPresenter, IQueryFormView>, IQueryFormView
switches to (for Design view)
public partial class QueryForm : Form
and the user-control goes from
public partial class UcQueryScreenFTAndOI : MvpControlBase<UCQueryScreenFTAndOIPresenter, IUCQueryScreenFTAndOIView>, IUCQueryScreenFTAndOIView
to (for design view)
public partial class UcQueryScreenFTAndOI : UserControl
So I do not think that would be an issue for the Designer since as far as it concerned, my winform/usercontrol inherits from the windows base classes.

I see one thing that seems incorrect; QueryForm is not derived from Form and UcQueryScreenFTAndOI is not derived from UserControl, but should they be like that? It seems strange that the compiler would not complain and that that would cause the behavior that you are seeing, but if I am correct that the classes should be derived as I think, then let's try to fix that first.

The 6 instances are created in the form's designer.cs file.
In Design view of the form, I can see the list of magically created DGV in the Property list of the form but they do not show up on the form itself (when there are more than the "initial" 6 it created).  The 6 that it created are the Grids within the UserControl (each instance of the UC has 3 grids).
I used Document View (in the Designer) to see how controls are on the Form and those magically created DGV do not show up in the Document View at all!
But if selected in the Property window (ie say I selected dataGridView13) then I see that a DGV in one of the usercontrol has been selected.
If I make a change to the Form and save then go back into Designer view, there it creates another 6 instances and so now I would have 12 in the designer.cs file.
Really truly bizarre behaviour.
Have zipped up both designer.cs files (after I had cleaned the form designer file)

You say six "instances of a DataGridView control created" but you do not state explicitly where. In the form or in the usercontrol? What happens when you look at the designer view of the usercontrol?
 
you say that there are 3, then every time 6, then nearly 600. I don't understand that; is it always 6 or not?
 
There is probably something incorrect in the designer.cs file but I don't know if it is the file for the form or the usercontrol since your description is unclear. If you don't mind uploading the source code then upload at least the designer.cs file for either the form or the usercontrol.