Maybe its only a little bug or its me ;-)
I got 4 Buttons on the top and a table view unter those.
my buttons have this little "arrow" unter them (like on many web2.0 websites in the navigation). These arrows should be 5 pixels on this table view.
I set the zIndex of my tableview to "10" and my buttons to "20".
But still my buttons are "under" the tableview.
try to add them to stage after you added your tableview.