VB.net Range selection requires user hitting enter

Hi

In VB.net 2010 I am using the following code to allow the user to select an Excel range from behind an Excel form. The problem is that omnce the range is selected the user still has to hit enter for the form to come back up. I am pretty sure that this wasn't the case in previous versions. How do I change it so that once the range is selected the rest of the code runs automatically?
Thanks

Private Sub Button_SelectRange_Click(sender As System.Object, e As System.EventArgs) Handles Button_SelectRange.Click
        ' MsgBox(Globals.ThisAddIn.Application.ActiveSheet.cells(1, 1).value)
        Try
            Me.Hide()
            Dim R As Microsoft.Office.Interop.Excel.Range
            Dim A As String
            'note how the Application.InputBox brings up different settings to just InputBox
            R = Globals.ThisAddIn.Application.InputBox(Prompt:="Please select range", Type:=8)
            A = R.Address
            Me.TextBox1.Text = A
            Me.Show()
            Me.TopMost = True
            Exit Sub

        Catch
            MsgBox("Please select a valid range!")
            Me.Show()
        End Try
    End Sub

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