[VB.NET] Form Padre e Form Figlie

            foreach (Form f in this.MdiChildren)
            {
                if (f.GetType() == form.GetType())
                {
                    f.Activate();
                    break;
                }
            }

Dim Form2 As New Form2
        Form2.MdiParent = Me

        Form2.Show()

...
ApriForm(new Form2());
...

private void ApriForm(Form form)
{
   Cursor.Current = Cursors.WaitCursor;

   foreach (Form f in this.MdiChildren)
    {
       if (f.GetType() == form.GetType())
       {
          form = f;
          break;
       }
    }

    form.MdiParent = this;
    form.WindowState = FormWindowState.Maximized;
    form.Show();

    Cursor.Current = Cursors.Default;
}

    Private Sub ApriForm(ByVal form As Form)
        Cursor.Current = Cursors.WaitCursor

        For Each f As Form In Me.MdiChildren
            If f.GetType Is form.GetType Then
                form = f
                Exit For
            End If
        Next

        form.MdiParent = Me
        form.WindowState = FormWindowState.Maximized
        form.Show()

        Cursor.Current = Cursors.Default

    End Sub