Same as my post on compound controls. TPageControl maps to the platform pagecontrol.
You can try to change widget sets (ie: QT/GTK/CustomDrawn) or, there are a few pagecontrols in various packages, none-of-which stand out as exceptional. (IMHO)
** EDIT **
It isn't hard to create a ad hoc page control using you choice of button bar. ie: TToolBar, left aligned TButtons, etc., with a TPanel containing TPanels (tab sheets). A button click brings a selected TPanel to front.