referencing an object that's on another form [RESOLVED]

[Andy]

I am writing a function that has arguments passed to it....no problem. But, I need determine the checkstate of a checkbox that does not get passed to it.

I have this code and it says: Reference to a non-shared member requires an object reference.

Public Function FormatPhoneNumber(ByVal PhoneNumber As String) As String
        Dim three As String
        Dim four As String
        three = Left(PhoneNumber, 3)
        four = Mid(PhoneNumber, 4)
        If  [COLOR=red]fclsTicketingMain.tabMainControl.tabTrbTick.chk423.checkstate[/COLOR] = True Then
            PhoneNumber = "(423)" & " " & three & "-" & "four"
        Else
            PhoneNumber = "(706)" & " " & three & "-" & "four"
        End If
    End Function

what has to be done to be able to use the state of the check box