VB.net User Control button press raise event to parent form

Hi Experts,

I am a complete novice in vb.net.  I have a form with a panel within which sits several user controls.  Depending on what activity the user is performing, a different user control is displayed in the panel.  No problems.

However, I would like one of the user controls to have 6 buttons, that when pressed, the master form can understand which button has been pressed.

I tried to add an Event to the User Control but it says the handles clause requires a WithEvents variable defined in the containing type or one of its base types.  But I couldn't get that working so I've come to you for some help.

UserControl:
Public Class UserControl1

    Public Event S1_Button_Click(ByVal sender As System.Object, ByVal e As System.EventArgs)

    Public Sub ButtonG2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ButtonG2.Click
        RaiseEvent S1_Button_Click(sender, e)
    End Sub

End Class

Form:
Public Class Form1

    Dim Screen1 As UserControl1
    Dim Active_screen As System.Windows.Forms.Control

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

        Screen1 = New UserControl1
        Panel1.Controls.Add(Screen1)
        Active_screen = Screen1

    End Sub

    Private Sub Screen1_Button_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Screen1.S1_Button_Click
            MsgBox("Button pressed!") <----- Here I want to understand which button was pressed but I've put this to just get it going
    End Sub

End Class