Show User Form After Workbook_open Code Has Executed

i have this code which askes the user for a job number once the workbook is opened.

Private Sub Workbook_open()

' If sheet was named by original open routine, exit

If ActiveSheet.Name = "Main Roof" Then Exit Sub

' otherwise

Do
Returnvalue = InputBox("Please Enter a New Job Number.", "Information")

' Allow changes by entering q as the Job Number
If Returnvalue = "q" Then Exit Sub


' Delete the ' from the front of the following two lines and
' then when you enter q as the Job Number you will also be
' asked for a password. The default password is toe.

what iam trying to do is get it to open the userform "WorkSelection" after it has completed the above code.