[Development] Desktop components: project directory structure

[Alberto Mardegan]

Hi all,
   I've got a question about the QML Desktop components at:
https://qt.gitorious.org/qtplayground/qtdesktopcomponents

Some components, such as TextField, are implemented as a derivative of 
another (homonymous) component defined in the "custom/" subdirectory. 
Why is this separation needed? Are there guidelines which tell whether 
some piece of code should belong to the toplevel component or in the 
"custom/" implementation?

Ciao,
   Alberto