Not all available form parts show in form parts tab

Why is it I cannot choose the Title header part for my Form.
The forms in my solution have only 5 available body parts, but the forms for example in mod_dialog do have 9 available.
Where are these parts coming form, or even better, how can I activate them in my Solution?

Hi,

In the form editor you find 4 Tabs at the bottom. One of them is called ‘Parts’. Here you can manage your form parts.

Hope this helps.

How do you mean manage? Not all form parts are shown here. Should I check a box or something to load all parts?

Hi,

In that tab you see 2 lists, the one on the left are the available (non-used) parts, on the right you see the used form-parts.
By moving them left or right you manage your used form parts.

Hope this helps.

Thanks for yout reaction, but thats not my point. The other part options aren’t even shown. See picture

[attachment=0]parts.PNG[/attachment]
How can I get all options shown?

I’m guessing that’s a subform and you’ve deleted those parts in the main one

A subform can’t have “higher” parts than the form that it extends.

So if there is a form A that has a body part and a form B that extends A, then you can’t add a header on B. That’s what’s happening in your case.
You can add a header in form A though, and form B will inherit it automatically.