Instead of an Event, try...
VB Code:
  1. 'In the UserControl
  2. Public Function GetCalc() as long
  3.     GetCalc = Val(Text1.Text) * Val(Text2.Text)
  4. End Function
  5.  
  6. 'In the Program
  7. Private Sub Command1_Click()
  8.     text1.text=UserControl1.GetCalc()
  9. End Sub
Does the same thing. Just less code.

BTW... What does the program do ? Is it just a test app or something in particular ?