Using objects on different forms [Resolved]

[LITHIA]

hi,
this question should be really easy, and i dont understand why something so easy is causing me problems...

I have a form, called frmMain which starts up with the program. Now in a class called Connection.vb it does several things, and at a certain point in the class i want it to update a listbox on frmMain.

How the hell do i go about adding an item to a listbox on frmMain when im in this class?

I know about methods where u have to declare the form, like
Dim formMain as New frmMain

but the thing is, doing that will make a new instance of the form and not update the listbox on the form that is already open.

doing
Dim formMain as frmMain
won't work either, i get some error.

How do i do this? I just don't understand... without any declorations, and write frmMain. I get options like ActiveForm and don't understand...

in VB6 this was so easy, you just simply wrote frmMain.textbox1.text = "bla"

so why can't you just do something that easy in VB.NET? like
frmMain.listbox1.items.add("blah")

Thanks for the help