Well sorry you feel that way but I figured that since the second and third link in that search solves your problem in two different ways, I guess I just figured that you were smart enough and determined enough to find them. But hey, I guess that is what I get for thinking...
For Each ctrl As Control In Me.Controls("pnlMainPanel").Controls
If ctrl.GetType Is GetType(System.Windows.Forms.Panel) Then
For Each subCtrl As Control In ctrl.Controls
If subCtrl.GetType Is GetType(System.Windows.Forms.TextBox) Then
If subCtrl.GetType Is ...