MDI child property in DLL

hi,
I have a project containing 10 modules.Each Module consists of 2forms.

Now i have decided to create each module in seperate dll.

and in my main project i will have only MDIForm and through menu i will create objects of these dll's to shown the forms of that particular module.

This is where problem comes.
My dll can not have MDIFORM(because it is a only one of the module of whole project)
and also i can not set the mdichild property at runtime.

Now when I create an object of dll.The form from dll is not a child form which actually is not the requirement.

I tried to set the parent property of the forms using setParent API.but it doesn't fully solves the purpose for e.g.

1) I could not get the form maximised at startup.
2) The title bar of form from dll doesn't gets disappeared when maximised manually.

So is there a another way to acheive what i m trying to achieve.

Eagrly Waiting for response as it is urgent.