Help with using mutiple Forms in application converted to DLL file

Hi,

When attempting to activate another Form  I received the following error message:

"Reference to a non-shared member requires an object reference"

code. from Form1 to activate for Form2:

If Form2.checkbox1.checked = True *****Error Line
.column(2).visible - False
End If

Also the "End" Command does not work when the application is converted to a DLL, what is the correct code to end the application?

Thanks,

Victor