timer触发控制

我想当按钮按下后触发TIMER事件，但是这个代码结果是一加载程序就触发了，错在哪里？请高手指点，或我的QQ593658084，


Public Class Form1

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

        JDT1.Height = 140
        JDT1.Enabled = False


    End Sub

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click, Timer1.Tick
        Dim y As Integer
        JDT1.Enabled = True
        y = 2
        If JDT1.Height <= 140 Then

            JDT1.Height = JDT1.Height - y
            If JDT1.Height = -2 Then
                JDT1.Height = JDT1.Height + y
            End If
        End If
    End Sub

    Private Sub timer1_timer()
        JDT1.Enabled = True
    End Sub

End Class