Разблокировка кнопки по таймеру - Visual Basic .NET

'---------------------------------------------------
Public Class Form1
 
    Dim myTime As Integer = 10

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Timer1.Start()
    End Sub
 
    Private Sub Timer1_Tick(ByVal sender As Object, ByVal e As System.EventArgs) Handles Timer1.Tick
        Button1.Text = TimeFormat(myTime)
        myTime -= 1
    End Sub
 
    Function TimeFormat(ByVal myTime As Integer)
 
        Dim i As Integer
        Dim TimeString As String
        Dim ss As Integer
        Dim sss As String
 
        For i = 1 To myTime
            ss += 1
            If ss = 60 Then
                ss = 0
 
            End If
        Next
 
        If ss < 10 Then sss = "0" & CStr(ss) Else sss = CStr(ss)
 
        TimeString = CStr(sss)
        'Button1.Enabled = True
        Return TimeString
    End Function
 
End Class