Using ActiveAdmin (0.5.1) I would like to make multiple different forms for creating an object and saving it to my database. I'm trying to do this by using `ActiveAdmin.register_page`, but I'm running into trouble while trying to create the form. It seems that while using `register_page`, you do not get the same `form` method as in a `register` call. Here's the code:

```
ActiveAdmin.register_page "New Object" do
  content do
    para "Here you can create new objects!"
    para "This content will be replaced with links to the specialized forms"
  end
end

```

And the code for one of the forms:

```
ActiveAdmin.register_page "Type 1" do
  menu :label => "Type 1", :parent => "New Object"

  content do
    panel "Attributes" do
      form do |f|
        f.input :color
        f.input :size
    end
  end
end

```

However this form will not render in any workable manner. Also `f.inputs` as well as many other methods you can see in examples (like [this](http://activeadmin.info/docs/5-forms.html)) do not work. Is it possible to make fully functional forms using `ActiveAdmin#register_page`?