Show Form in Custom Installer

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C#

In My setup project there is code like:

  [RunInstaller(true)]
    public partial class Installer1 : Installer
    {
        public Installer1()
        {
            InitializeComponent();
        }
        public override void Install(System.Collections.IDictionary stateSaver)
        {
            base.Install(stateSaver);
        }
        private void Installer1_AfterInstall(object sender, InstallEventArgs e)
        {
           Form1 topmostForm = new Form1();
            topmostForm.Focus();
            topmostForm.BringToFront();
            topmostForm.TopMost = true;
            topmostForm.ShowDialog();
      }
}

When I call topmostForm.ShowDialog(), that time form is shown in back side of default installer screen.
I want to topmostForm front side of installer Screen.

I think you got my idea....
Please help me...