interface Iterable on build

when i open my project in 2019.r3 i get the following error:

videoplayer.controls.Name Layout (property name) Return type (class Rectangle) does not match overridden method's return type (interface Iterable)

in Versions before 2019.r3 everything is working fine, what does that mean?

changing the name from “controls” to “controlspanel” works. Seems the name “controls” is reserved…

Xojo took over the name Controls to provide a new method to get the iterable set of controls on a layout