Added property to inspector behaviour not displaying

I need a few common window information which I tried to add it to the windows inspector behaviour, but they are not getting displayed …

is something missing ?

there are some classes that does not display in the inspector, even if the “inspector behavior” command allows you to add properties.
any window subclass are among them I never could add a property to them.

(this is a private case for testers that is still like this. dated october 2014…)

thanks for the info, one day maybe, after Android …