Odd problem with Form

Visual Studio 2012 - Winforms - C#

I copied a form from one project and included it in another project.

I copied the form.cs, form.Designer.cs and the form.resx files to the other project.

I renamed the form's Namespaces and everything compiles and runs perfect.

But when I try and look at the form in Visual Studio all the controls are missing (completely empty) and the form is the default size.

When I run the program the form and all the controls are there and they all works perfectly.

Why can't I see the form and it's controls in Visual Studio?

Thanks