How do you expand a form at runtime in VB.NET to display more information?

I have a form in VB.NET and I would like the user to be able to click a button which will display another form (with开发者_StackOverflow中文版 the original form still visible).

How do I do this?

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Protected Sub MyButton_Click(sender As Object, e As EventArgs) _
        Handles MyButton.Click

    Dim MySecondForm As New MySecondFormType()
    MySecondForm.Show()

End Sub