Promote Qwidget problem, class already exists ???

[tonnot]

I have a Qwidget component. It is named MyWidget
It works ok.
If I define the promoted widget to 'mywidget' , QTCreator let me.
But when I want to build I see errors related with there is no 'mywidget reference'.
I have to change manually to 'MyWidget' (with M and W uppercase letters) and all works fine.
If I want to define the promoted widget with 'MyWidget' letters, QTCreator says me 'The class already exists' ....
I have reset QtCreator, but nothing changes....
What I'm doing bad ?


P.D. And ..... What means 'Global include' when you define the promoted W.? (I dont see nothing at help docs)

Thanks