Hide and restore the GUI Mutiple forms in c#

I have multiple form application. Form 1 is Login form for user validation. Form1 goes to Form2(Menu form). Form 2 leads to Form3 which is only popupform and hides the form2 when it is open.Form 3 goes to Form 4. Now from Form4 ,with button click, I need to restore the Form2 without creating a new instance. I tried using singelton approach, getting error.Code as follows as described above.

Form1:

private void click_Click(object sender, EventArgs e)

{

if ((user.Text == username) && (pswd.Text == password))

{ Form2 menu = new Form2();

            menu.Username = user.Text;
            //hides the form1
            this.Hide();      
            menu.ShowDialog();
        }
    }

Form2:

private static Form2 instance;

    public static Form2 Instance
    {
        get
        {
            if (instance == null)
            {
                instance = new Form2();
            }
            return instance;
        }
    }

private void button_Click(object sender, EventArgs e) {

        //Hide the form2
        Hide();
        //Bring up your PopUp form
        using (Form3 form3 = new Form3())
            form3.ShowDialog();

    }

Form3:

private void button_Click(object sender, EventArgs e)

{
        Hide();
        Form4 form4 = new Form4();
        form4.Show();
    }

Form4:

private void button1_Click(object sender, EventArgs e)

{

        Form2 form2 = Form2.Instance;//error occured as

Mainmenu does not contain a reference for Instance and no extension method accepting a first argument of type 'Mainmenu'

    }

Basically, I want to restore the Form2 that was hided.Any help would be appreciated!Thanks

---

How about keeping track of the Forms parents so you have direct access. For example in your Form1:

menu.Parent = this;
Hide();
menu.ShowDialog();

Then in your Form2 when Form3 is called:

using (Form3 f3 = new Form3())
{
    Hide();
    f3.Parent = this.Parent;
    f3.ShowDialog();
}

Then when you want to dispose of Form3:

this.Parent.Show();
this.Parent.Focus();
this.Dispose();

Something along this lines for as many open forms as you need. If you need to drop back to the previous form, then make the Parent 'this' instead of 'this.Parent'

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