Android Question Can't disable button

Sub Btn_Load_WebPage_Click
  
    Btn_Action.Enabled=False
    Pnl_Loading.Visible=True
    Pnl_Loading.BringToFront
    Counter_Click=0
    Btn_Action.Text="Action Clicked " & Counter_Click & " times"
    Sleep(200)
    Dim j As HttpJob
    j.Initialize("", Me) 'name is empty as it is no longer needed
    j.Download("https://www.b4x.com/")
          
    Wait For (j) JobDone(j As HttpJob)
    If j.Success Then
        'Do some staff...
        Dim a=0 As Int
        For i=0 To 4000000
            If i Mod 5000 = 1 Then Sleep(10)
            a=a+Sqrt(Rnd(0,10))
        Next
    Else
        Log(j.ErrorMessage)
        ' Use log or use asyncdialogs
      
        'Msgbox(j.ErrorMessage,"Error")
    End If
    j.Release
    Sleep(200)
    Pnl_Loading.Visible=False
    Btn_Action.Enabled=True
End Sub