how to make a button stay the same way like when you click it

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hey
am building a button class in the programming language visual basic
i just need some help with the coding
so far i have something that looks like this

Imports System.Drawing
Public Class YOUR CLASS NAME
    Inherits Windows.Forms.Button
    Public Sub New()
        Me.Size = New Point(32, 32)
        Me.FlatStyle = Windows.Forms.FlatStyle.Flat
        Me.FlatAppearance.BorderSize = 0
        Me.FlatAppearance.BorderColor = System.Drawing.Color.Gray
        Me.FlatAppearance.MouseDownBackColor = System.Drawing.Color.Transparent
        Me.FlatAppearance.MouseOverBackColor = System.Drawing.Color.Transparent
        Me.BackColor = System.Drawing.Color.Transparent
        Me.BackgroundImage = My.Resources.YOUR NORMAL IMAGE
        Me.BackgroundImageLayout = Windows.Forms.ImageLayout.Stretch
        Me.Font = New System.Drawing.Font("Tahoma", 9.0!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
    End Sub
Private Sub Backbutton_MouseDown(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles Me.MouseDown
        Me.BackgroundImage  My.Resources = your mouse click the image
    End Sub
 Private Sub Backbutton_MouseEnter(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.MouseEnter
        Me.BackgroundImage = My.Resources.YOUR MOUSE ON IMAGE
    End Sub
Private Sub Backbutton_MouseLeave(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.MouseLeave
        Me.BackgroundImage = My.Resources.YOUR NORMAL IMAGE
    End Sub
Private Sub Backbutton_MouseUp(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles Me.MouseUp
        Me.BackgroundImage = My.Resources.YOUR MOUSE ON IMAGE
    End Sub
End Class

and i want it the button to be like Me.BackgroundImage My.Resources = your mouse click the image or just simply when u click it just want it to stay this way

thanks in advance