How to display a floating control when the hostform is minimized in WinForms Docking Manager?

private void Form1_Layout(object sender, LayoutEventArgs e)
{
  if (this.WindowState == FormWindowState.Minimized)
  {
    if (dockingManager1.IsFloating(panel1))
     {
        FloatingForm ff = panel1.Parent.Parent as FloatingForm;
        ff.WindowState = FormWindowState.Normal;
        ff.Visible = true;
     }
  }
}

Private Sub Form1_Layout(ByVal sender As Object, ByVal e As LayoutEventArgs) Handles MyBase.Layout
  If Me.WindowState = FormWindowState.Minimized Then
     If dockingManager1.IsFloating(panel1) Then
        Dim ff As FloatingForm = TryCast(panel1.Parent.Parent, FloatingForm)
        ff.WindowState = FormWindowState.Normal
        ff.Visible = True
     End If
  End If
End Sub