Microsoft unveiled new privacy controls and settings coming to the Windows 10 Creators Update in January this year, and began testing those new controls with Insiders in late January.
Again it's only the User Control that exhibits this behavior - the stock controls work fine here.
After all, users like to be presented with a consistent interface, so re-use makes sense.
Pik Botha's grandson, Roelof, has been ranked as high as 22nd on the Forbes Midas list of venture capitalists, having funded the launch of You Tube in 2005.
But they've done it as individuals, and – with the notable exception of commercial spaceflight pioneer Elon Musk – almost invisibly.
The WPF and Silverlight frameworks provide custom controls and user controls as a mechanism for re-using blocks of UI elements.