Done. It's a hack and I know it. But it works.
My LoginPanel controls what card to show in my CardLayoutPanel. I took the add & show statements out of the main class in CardLayoutpanel and placed in inside the public method that received LoginPanel String that controls viewed card.
A simple "if" stringReceived whatever.equal("success"), add successPanel to CardLayoutPanel and show it. WORKS EXACTLY LIKE I WANT IT TO! AWESOME!
Once again, thank you for your responses and for your help guys.
Ubuntu: Because rebooting is ONLY for installing hardware