Visual C++ - opening and closing forms

Bit of a problem. I'm pretty new to using Visual C++ (I'm using the 2008 Express Edition).

I'm creating a Windows Forms application which is pretty straightforward. I've got everything working so far, except I need to know how to open and close the forms themselves.

I've created a menu system which the user can navigate. I want it so that clicking a button will show a particular form whilst hiding the form we came from.

I did actually manage to get a fair bit of this working by declaring the forms at the top (#include "form1.h" and all that lot) and could actually open the forms using:

Code:

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Form1 ^ form = gcnew Form1;
form->ShowDialog();

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Unfortunately, whilst this does work, because I have to specify the .h files in each form's code it seems to overload it (although I do only have four forms). I think it's a Visual C++ version of a circular reference as form1 has to load form2's .h which in turn loads form1's...

Also, how do I close a form when another form opens?

Any help would be much appreciated - this is the final thing that needs sorting.