Close parent form

hi

I am using vb.net 2010 i set the main form as parent the problem when i close the main form its open the last closed child form before close the app i am using this code for open child forms

Dim FForm1 As New Form1
        If Application.OpenForms().OfType(Of Form1).Any Then
        Else
            FForm1.MdiParent = Me
            FForm1.Show()
        End If

and i use msg for confirm close main form using this code

  Select MessageBox.Show("exit ?", _
                             " confirm exit", MessageBoxButtons.OKCancel, MessageBoxIcon.Warning, MessageBoxDefaultButton.Button2, MessageBoxOptions.RightAlign)

            Case Windows.Forms.DialogResult.Yes
  

            Case Windows.Forms.DialogResult.No
                e.Cancel = True
        End Select

why its open the last closed child form before close the main form ?

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Eskandrany