New article MQL for "Dummies": How to Design and Construct Object Classes is published:
It can't be compiled.
'w_corner' - can't convert enum ClassWin.mqh 114 20
use explicit typecasting:
C'mon...are you kidding?
This isn't a "Dummies" guide for a new programmer trying to learn OOP...it's a bunch of goobleygook. You cut-n-paste some code from an application that is way too obscure to be helpful to a new or beginning programmer.