event handler for multiple controls vb.net

AM trying trap specific events for some controls on a form. i tried this, but its not fireing the events

 For Each ctrl As Control In pnlGeneral.Controls
            If TypeOf ctrl Is CheckBox Then
                AddHandler (DirectCast(ctrl, CheckBox).CheckedChanged), AddressOf Control_Changed
            ElseIf TypeOf ctrl Is TextBox Then
                AddHandler (ctrl.TextChanged), AddressOf Control_Changed
            ElseIf TypeOf ctrl Is NumericUpDown Then
                AddHandler (DirectCast(ctrl, NumericUpDown).ValueChanged), AddressOf Control_Changed
            End If

        Next

Can anyone help me with the fix?

EDIT

I found out that am placing the control in multiple controls, on the form is a panel, inside the panel is different groupbox, these group boxes 开发者_C百科have the controls am trying to trap their events

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So as Lars said it does appear to work.

edited in place to account for controls in containers

Private Sub Form1_Shown(sender As Object, e As System.EventArgs) Handles Me.Shown
    Dim ctrl As Control = Me.GetNextControl(Me, True)
    Do Until ctrl Is Nothing
        If TypeOf ctrl Is CheckBox Then
            AddHandler (DirectCast(ctrl, CheckBox).CheckedChanged), AddressOf Control_Changed
        ElseIf TypeOf ctrl Is TextBox Then
            AddHandler (ctrl.TextChanged), AddressOf Control_Changed
        ElseIf TypeOf ctrl Is NumericUpDown Then
            AddHandler (DirectCast(ctrl, NumericUpDown).ValueChanged), AddressOf Control_Changed
        End If
        ctrl = Me.GetNextControl(ctrl, True)
    Loop
End Sub

Private Sub Control_Changed(sender As System.Object, e As System.EventArgs)
    Debug.WriteLine(sender.ToString)
End Sub

---

Private Sub Form_Activate(Byval sender As Object,Byval e as System.EventArgs) Handles Form.Activate

    Dim Ctrl as System.Windows.Forms.Control

    For Each Ctrl in Me.Controls
    If Typeof Ctrl Is System.Windows.Forms.TextBox then
    AddHandler Ctrl.GotFocus, AddressOf TextFocus
    AddHandler Ctrl.LostFocus, AddressOf TextUnfocus
    Next
End Sub

Private Sub TextFocus(ByVal sender As Object, ByVal e As System.EventArgs)
    CType(sender,System.Windows.Forms.TextBox).BackColor = Color.Blue
End Sub

Private Sub TextUnfocus(ByVal sender As Object, ByVal e As System.EventArgs)
    CType(sender, System.Windows.Forms.TextBox).BackColor = Color.White
End Sub