Handeling user controls event click when added dynamically

Hallo Experts,
I have made a User Control containing Button1and textbox1
Then added the following code to the control:
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Public Class button_panel
    Inherits System.Windows.Forms.UserControl
    Public Property txtValue() As String
        Get
            Return TextBox1.Text
        End Get
        Set(ByVal value As String)
            TextBox1.Text = value
        End Set
    End Property
End Class
________________________________________________



In the form I have the code:
_______________________________________________
  Private Sub ModularPortal_Load(ByVal sender As Object, ByVal e As EventArgs) Handles MyBase.Load
        Create_buttons()
        Create_buttons()
    End Sub
    Private MNButtonCount As Integer = 0
    Private Sub Create_buttons()
        Dim NewButton As New button_panel()
        NewButton.Location = New System.Drawing.Point(12, 204 + MNButtonCount)
        AddHandler NewButton.Click, AddressOf alfa
        Me.mnupanel.Controls.Add(NewButton)
        MNButtonCount += 100
    End Sub
    Public Sub alfa(ByVal sender As Object, ByVal e As EventArgs)
        sender.txtValue = "OK"
    End Sub
__________________________________________________________

When running, 2 buttons and2  textfields is made, with background from the User Control.
By clicking on one of the buttons, "Public Sub alfa" is not triggered.
If I click on the panel beside the buttons on the background from the User Control. "Public Sub alfa" is triggered and writing back to the correct User Control text field.

How do I redirect the button click event to trigger Public Sub alfa ?

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