you can start to check for palindromes write a separate method why won't you!! check after reversing the individual input strings and if their reversed version is equal to the original version the one which you extracted in the array as described just above you can confirm whether read string was a palindrome or otherwise!!
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 ...