Treeview and panel in C#, case go to next form

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C#

I am trying to make a desktop application using treeview and Panel it works fine a bit. But when i try to does not change like for instance, if i click Account opening, it opens the form, but if i click to go to a different form inside the application it doesnt change , you have to restart the form again to move to another form inside the main application My source code looks like this :

private void treeView1_AfterSelect(object sender, TreeViewEventArgs e)
{
    switch (e.Node.Text)
    {
        case "Account Opening":
            f = new AccountOpening();
            f.TopLevel = false;
            this.panel1.Controls.Add(f);
            f.Dock = DockStyle.Fill;
            f.Show();
            break;

        case "Check Balance":
            f = new CheckBalance();
            f.TopLevel = false;
            this.panel1.Controls.Add(f);
            f.Dock = DockStyle.Fill;
            f.Show();
            break;

        case "Deposit":
            f = new Deposit();
            f.TopLevel = false;
            this.panel1.Controls.Add(f);
            f.Dock = DockStyle.Fill;
            f.Show();
            break;

        case "Loan Repayment":
            f = new LoanRepayment();
            f.TopLevel = false;
            this.panel1.Controls.Add(f);
            f.Dock = DockStyle.Fill;
            f.Show();
            break;


        case "Transfers":
            f = new Transfers();
            f.TopLevel = false;
            this.panel1.Controls.Add(f);
            f.Dock = DockStyle.Fill;
            f.Show();
            break;

        case "Withdrawal":
            f = new Withdrawal();
            f.TopLevel = false;
            this.panel1.Controls.Add(f);
            f.Dock = DockStyle.Fill;
            f.Show();
            break;
    }
}

Apparently what am i missing?

What I have tried:

I have used If and simple switch case, doesnt seem to work as i expect