How to match Button array from a class to dynamically created button on a form

here is my code...
from this code i get a null reference exception...
all other labels,buttons.tooltips are already there the form1 and i got no problem ..the problem is only with the btn
that i want to match it with the dynamically created Button...
thank you very much...

Public Class md
    Public state As String
    Public snoozeIconBtn As Button
    Public lbl As Label
    Public pb As PictureBox
    Public stateLbl As Label
    Public tooltip As ToolTip
    Public hover As Label
    Public c As Integer
    Public sch(40) As timeSpan
    Public sch_count As Integer
    Public name As String
    Public active As Boolean
    Public alarmOn As Boolean
    Public attentionOn As Boolean
    Public Sensor As String
    Public GetSensorsName As String
    Public tr As Label
    Public rec As String
    Public btn As Button
    Private RedFlag As Boolean
    'public readonly property

    
    Public Sub New(ByVal i As Integer)

        Me.btn = Form1.fbtn(i)   '>>>>>>if fbtn(i) buttons are alreadey there , i can figure it out but there are not yet
        Me.lbl = Form1.lbl(i)
        Me.stateLbl = Form1.state(i)
        Me.tooltip = Form1.tooltip(i)
        Me.hover = Form1.hover(i)
        Me.c = i
        Me.sch_count = 0
        Me.snoozeIconBtn = Form1.snoozeIconBtn(i)
        Me.pb = Form1.Picturebox(i)
        Me.Sensor = Form1.sensor(i)
        Me.tr = Form1.act(i)
    End Sub
    
    
    Public Sub setAlarm(ByVal val As Boolean)
        If val = True Then
            RedFlag = True
            Me.btn.BackColor = Color.Red    '>>>> here i got the exception !!!!
            Me.alarmOn = True
            ' rec = tr.Text
            GetSensorsName = Me.btn.Text
        Else
            RedFlag = False
            Me.btn.BackColor = Color.Lime
            Me.alarmOn = False
            ' rec = tr.Text
            GetSensorsName = Me.btn.Text
        End If
    End Sub

'in my form

Public Class Form1

    Public md(NumberOfSensors) As md          '>>>>>>  NumberOfSensors is a public integer variable 
    Public fbtn(NumberOfSensors) As Button
    Public snoozeIconBtn(NumberOfSensors) As Button
    Public lbl(NumberOfSensors) As Label
    Public Picturebox(NumberOfSensors) As PictureBox
    Public state(NumberOfSensors) As Label
    Public tooltip(NumberOfSensors) As ToolTip
    Public hover(NumberOfSensors) As Label
    Public sensor(NumberOfSensors) As String
    Public act(NumberOfSensors) As Label
   

 Private Sub initMdArray()   'this sub is set to form load event
              For j = 0 To NumberOfSensors - 1
'here i initiallize also the other controls
            btn(j) = Me.fbtn(j + 1)

            md(j) = New md(j)
        Next        
    End Sub


'form1 create buttons

For i As Integer = 0 To Rcount - 1

            Button.Name = "Button" & i + 1
            Button.Text = ds.Tables(0).Rows(i).Item(1)
            Button.Dock = DockStyle.Fill
            Button.FlatStyle = FlatStyle.Flat
            Button.Cursor = Cursors.Hand
            Button.BackColor = Color.White
                        fbtn(i) = Button      '<<<<<< is this correct   ??????
            dynamicTableLayoutPanel.Controls.Add(Button, 0, i)

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