TPageControl Question

I need to be able to selectively dis/allow selection of different tabs on
the TPageControl.  I know that the OnChanging event can be used to
disallow a tab change but I can't find any way to determine what tab is
about to be selected.  Is there a way to determine the tab that is about
to be selected?  Any help in this matter would be greatly appreciated.


Shawn Pletch