Visual basic 2010 - re-using form

here's an example with 5 labels:

Public Class Form1

    Private Sub Labels_DoubleClick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Label5.DoubleClick, Label4.DoubleClick, Label3.DoubleClick, Label2.DoubleClick, Label1.DoubleClick
        Dim f As New Form2(DirectCast(sender, Label))
        f.ShowDialog()
    End Sub

End Class

Public Class Form2

    Dim subject As Label

    Public Sub New(ByVal subjectLabel As Label)
        InitializeComponent()
        subject = subjectLabel
    End Sub

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim cd As New ColorDialog
        If cd.ShowDialog = DialogResult.OK Then
            subject.BackColor = cd.Color
            Me.DialogResult = Windows.Forms.DialogResult.OK
        End If
    End Sub

End Class

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thanks for any help