С рамками проблема метро навигации пользовательские элементы управления на форме

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with metro framework I want to navigate form to user controls and user controls to form 

Что я уже пробовал:

В используемой форме

if(! frmAdminDashbord.Instance.MetroContainer.Controls.ContainsKey("UcCustomerList"))
            {
                UcCustomerList uc = new UcCustomerList();
                uc.Dock = DockStyle.Fill;
                frmAdminDashbord.Instance.MetroContainer.Controls.Add(uc);

            }
            frmAdminDashbord.Instance.MetroContainer.Controls["UcCustomerList"].BringToFront();
            frmAdminDashbord.Instance.btnCustomer.Visible = true;

and in the user control I used 

frmAdminDashbord uc = new frmAdminDashbord();
            uc.Dock = DockStyle.Fill;
            this.Hide();
            uc.BringToFront();
            uc.Show();
but in this case multiple instance is creating.

I want to stop multiple instance creation. 

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