Sizes

I’ve designed and coded a Mac tool and my customer want it also running on Windows 7 en 10.
My very beautiful Mac app is on Windows very ugly.

Is there any standard for Windows about heights of buttons/popup’s and other GUI elements?

Paste: Windows Interface Guidelines into Google ?

Controls

Nice.

Unfortunately, PopOver is in option with Xojo.

BTW: similar documents exists for OS X and Linux.

iOS ,
OS X ,
GNOME ,

and these URL are probably in the documentation.