IllegalCast while scanning Controls on a Window

Yes gentlemen, this is a link to the old doc entry for Windows…

It is really Boring to prefix everything…

Here’s a screenshot of the result:

But the TabPanel show at the right-bottom (in part) is not there; but an entry for another button (outside of the window) is displayed.

Maybe a mid-day nap is welcome (Andy where are-you ? He’s on the sofa doing his daily nap !)

Correction. It is Really Important to prefix everything.