Pass parameters though functn. in DLL

i want to create a DLL where i can pass parameters etc. this thing works when i do it through a class module.. i mean something like .. hmm..

Sub DisplayInCombo (vbComboBox as ComboBox)
vbComboBox.AddItem "Hello"
End Sub

when i do the above, through a class it works. but while compiling the DLL, it gives me an error.
Can someone please help? :(

ComboBox is specific to VB and ActiveX DLLs are not they are COM complaint so you'll have to try and pass it in as the generic type OBJECT and see if that works.