Set a form's designmode property via reflection

Question

I can create and show a form that is loaded from a dll file via reflection. I want to trick the floating form into thinking it is in design mode. I think it should be possible to find a backing variable in the form somewhere and set it via reflection but I can't quite find it AND the code to set it. Can someone help me find a way to get the form to think it is in design mode?

I know the property is read-only but maybe there is an underlying field.

Answer 1

From thehennyy's comment, I made a phony class to act as a site:

public class MySite : IServiceProvider, ISite
{
    public IComponent Component => null;
    public IContainer Container => null;
    public bool DesignMode => true;
    public string Name { get => ""; set => value = ""; }
    public object GetService(Type serviceType)
    {
        return null;
    }
}

Then before the form is launched I set the Site property to an instance of this class:

form.Site = new MySite();

This does work to make the form believe it is in design mode when actually it is not. Site is fortunately a public property.