TAdvOfficePager versus closing buttons on tabs

I'm using TAdvOfficePager for handling multiple tabs. I'd like to display a closing button on all tabs. I've created a new project and placed a TAddOfficePager on a TForm. I use the following code but there are no closing buttons visible.

AdvOfficePager1->ButtonSettings->CloseButton = true;
AdvOfficePager1->CloseOnTab = true; // No tabs are shown

What's missing in my code?

Thank you in advance for your help.

Set ShowClose = true on the tabs where you want to see the close button.

I forgot to mention, I use C++ Builder XE, Windows 7, TAdvOfficePager version

Excellent, it works perfectly. Thank you for your help! :)